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Page 1
Chemistry
ICS Boards 2023
SECTION – A
Question 1
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane,
Rosenmund’s]
(i) The primary alcohols are easily oxidized first into ______ and then into ________.
Answer: The primary alcohols are easily oxidized first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly _______ due to _______ energy.
Answer: The intermediate activated complex in a chemical reaction is highly unstable due to high energy.
(iii) The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are ______ and ______
respectively.
Answer: The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. ?? ?? ?? gives _______ and the reaction is
known as ________ reduction.
Answer: Propanone on reaction with zinc amalgam in presence of conc. ?? ?? ?? gives propane and the reaction is
known as Clemmensen’s reduction.
(B) Select and write the correct alternative from the choices given below:
(i) The reaction of a primary amine with chloroform and ethanolic ?????? is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fitting reaction
Answer (a)
Aliphatic or aromatic primary amines on heating with chloroform give foul smelling products called
isocyanides or carbylamines and the reaction is known as carbylamine reaction.
Page 2
Chemistry
ICS Boards 2023
SECTION – A
Question 1
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane,
Rosenmund’s]
(i) The primary alcohols are easily oxidized first into ______ and then into ________.
Answer: The primary alcohols are easily oxidized first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly _______ due to _______ energy.
Answer: The intermediate activated complex in a chemical reaction is highly unstable due to high energy.
(iii) The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are ______ and ______
respectively.
Answer: The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. ?? ?? ?? gives _______ and the reaction is
known as ________ reduction.
Answer: Propanone on reaction with zinc amalgam in presence of conc. ?? ?? ?? gives propane and the reaction is
known as Clemmensen’s reduction.
(B) Select and write the correct alternative from the choices given below:
(i) The reaction of a primary amine with chloroform and ethanolic ?????? is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fitting reaction
Answer (a)
Aliphatic or aromatic primary amines on heating with chloroform give foul smelling products called
isocyanides or carbylamines and the reaction is known as carbylamine reaction.
(ii) Which one of the following statements is TRUE for the galvanic cell?
(a) Electrons flow from copper electrode to zinc electrode.
(b) Current flows from zinc electrode to copper electrode
(c) Cations move towards copper electrode.
(d) Cations move towards zinc electrode.
Answer (c)
In Galvanic cell, following reaction occurs:
???? +????
2+
? ????
2+
+????
At anode: ???? ? ????
2+
+2?? -
At cathode: ????
2+
+2?? -
? ????
In this cell, electrons flow from anode to cathode i.e. zinc electrode to copper electrode whereas current
flows from copper electrode to zinc electrode in an external circuit. And cations i.e., ????
2+
ions move
towards the copper electrode.
(iii) Which one of the following compounds is diamagnetic and colourless?
(a) ?? 2
????
2
?? 7
(b) ?????? ?? 4
(c) ?????? ?? 4
(d) ?? ?? 2
(?? ?? 4
)
3
Answer (b)
?????? ?? 4
is a diamagnetic and colourless compound, because here ???? is in +2 oxidation state i.e., its
electronic configuration will be: [???? ]3?? 10
. Thus, ????
2+
has no unpaired electrons and it is colourless.
(iv) For a first order reaction, the half-life period (?? 1/2
) is:
(a) Proportional to the initial concentration.
(b) Inversely proportional to the initial concentration.
(c) Proportional to the square root of the initial concentration.
Independent of the initial concentration.
Answer (d)
For a first order reaction, half-life is independent of the initial concentration of the reactant.
?? 1/2
=
0.693
??
Hence, option (D) is the correct answer.
(C) Match the following:
(i) Phenol (a) Hexane + heptane
(ii) EDTA (b) Globular protein
(iii) Ideal solution (c) Azo dye
(iv) Insulin (d) Hexadentate ligand
Answer
(i) Phenol ? (c) Azo dye
(ii) EDTA ? (d) Hexadentate ligand
(iii) Ideal solution ? (a) hexane + heptane
(iv) Insulin ? (b) Globular protein
Page 3
Chemistry
ICS Boards 2023
SECTION – A
Question 1
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane,
Rosenmund’s]
(i) The primary alcohols are easily oxidized first into ______ and then into ________.
Answer: The primary alcohols are easily oxidized first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly _______ due to _______ energy.
Answer: The intermediate activated complex in a chemical reaction is highly unstable due to high energy.
(iii) The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are ______ and ______
respectively.
Answer: The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. ?? ?? ?? gives _______ and the reaction is
known as ________ reduction.
Answer: Propanone on reaction with zinc amalgam in presence of conc. ?? ?? ?? gives propane and the reaction is
known as Clemmensen’s reduction.
(B) Select and write the correct alternative from the choices given below:
(i) The reaction of a primary amine with chloroform and ethanolic ?????? is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fitting reaction
Answer (a)
Aliphatic or aromatic primary amines on heating with chloroform give foul smelling products called
isocyanides or carbylamines and the reaction is known as carbylamine reaction.
(ii) Which one of the following statements is TRUE for the galvanic cell?
(a) Electrons flow from copper electrode to zinc electrode.
(b) Current flows from zinc electrode to copper electrode
(c) Cations move towards copper electrode.
(d) Cations move towards zinc electrode.
Answer (c)
In Galvanic cell, following reaction occurs:
???? +????
2+
? ????
2+
+????
At anode: ???? ? ????
2+
+2?? -
At cathode: ????
2+
+2?? -
? ????
In this cell, electrons flow from anode to cathode i.e. zinc electrode to copper electrode whereas current
flows from copper electrode to zinc electrode in an external circuit. And cations i.e., ????
2+
ions move
towards the copper electrode.
(iii) Which one of the following compounds is diamagnetic and colourless?
(a) ?? 2
????
2
?? 7
(b) ?????? ?? 4
(c) ?????? ?? 4
(d) ?? ?? 2
(?? ?? 4
)
3
Answer (b)
?????? ?? 4
is a diamagnetic and colourless compound, because here ???? is in +2 oxidation state i.e., its
electronic configuration will be: [???? ]3?? 10
. Thus, ????
2+
has no unpaired electrons and it is colourless.
(iv) For a first order reaction, the half-life period (?? 1/2
) is:
(a) Proportional to the initial concentration.
(b) Inversely proportional to the initial concentration.
(c) Proportional to the square root of the initial concentration.
Independent of the initial concentration.
Answer (d)
For a first order reaction, half-life is independent of the initial concentration of the reactant.
?? 1/2
=
0.693
??
Hence, option (D) is the correct answer.
(C) Match the following:
(i) Phenol (a) Hexane + heptane
(ii) EDTA (b) Globular protein
(iii) Ideal solution (c) Azo dye
(iv) Insulin (d) Hexadentate ligand
Answer
(i) Phenol ? (c) Azo dye
(ii) EDTA ? (d) Hexadentate ligand
(iii) Ideal solution ? (a) hexane + heptane
(iv) Insulin ? (b) Globular protein
(D)
(i) Assertion: If a solution contains both ?? +
and ????
+
ions, the ?? +
ions are reduced first at cathode.
Reason: Cations with higher ?? 0
value are reduced first at cathode.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (a)
Reactions at cathode:
?? +
+?? -
?
1
2
?? 2
;?? 0
=0.0 ??
?? ?? +
+?? -
? ???? ; ?? 0
=-2.71 ??
The cations having higher positive reduction potential will be reduced first at the cathode, that’s why ?? +
reduced first at the cathode.
(ii) Assertion: Addition of bromine water to 1-butene gives two optical isomers.
Reason: The product formed contains two asymmetric carbon atoms.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (c)
Addition of bromine water to 1-butene gives two optical isomers as the product contains only one
asymmetric carbon.
Hence, the assertion is true, but reason is false.
SECTION – B
Question 2
Calculate the mass of ascorbic acid (molecular mass = 176 g/mol) that should be dissolved in 155 g of acetic acid
to cause a depression of freezing point by 1.15 K. Assume that ascorbic acid does not dissociate or associate in the
solution.
(?? ?? for acetic acid =3.9 ?? ???? /?????? )
Answer: Depression in freezing point =1.15 ??
As we know, ??? ?? =???? ?? ??
???? ?? =1×3.9×
?? 176×0.155
?
1.15×176×0.155
3.9
=??
i.e. ?? =8.044 ??
Thus, mass of ascorbic acid will be 8.044 ?? .
Page 4
Chemistry
ICS Boards 2023
SECTION – A
Question 1
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane,
Rosenmund’s]
(i) The primary alcohols are easily oxidized first into ______ and then into ________.
Answer: The primary alcohols are easily oxidized first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly _______ due to _______ energy.
Answer: The intermediate activated complex in a chemical reaction is highly unstable due to high energy.
(iii) The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are ______ and ______
respectively.
Answer: The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. ?? ?? ?? gives _______ and the reaction is
known as ________ reduction.
Answer: Propanone on reaction with zinc amalgam in presence of conc. ?? ?? ?? gives propane and the reaction is
known as Clemmensen’s reduction.
(B) Select and write the correct alternative from the choices given below:
(i) The reaction of a primary amine with chloroform and ethanolic ?????? is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fitting reaction
Answer (a)
Aliphatic or aromatic primary amines on heating with chloroform give foul smelling products called
isocyanides or carbylamines and the reaction is known as carbylamine reaction.
(ii) Which one of the following statements is TRUE for the galvanic cell?
(a) Electrons flow from copper electrode to zinc electrode.
(b) Current flows from zinc electrode to copper electrode
(c) Cations move towards copper electrode.
(d) Cations move towards zinc electrode.
Answer (c)
In Galvanic cell, following reaction occurs:
???? +????
2+
? ????
2+
+????
At anode: ???? ? ????
2+
+2?? -
At cathode: ????
2+
+2?? -
? ????
In this cell, electrons flow from anode to cathode i.e. zinc electrode to copper electrode whereas current
flows from copper electrode to zinc electrode in an external circuit. And cations i.e., ????
2+
ions move
towards the copper electrode.
(iii) Which one of the following compounds is diamagnetic and colourless?
(a) ?? 2
????
2
?? 7
(b) ?????? ?? 4
(c) ?????? ?? 4
(d) ?? ?? 2
(?? ?? 4
)
3
Answer (b)
?????? ?? 4
is a diamagnetic and colourless compound, because here ???? is in +2 oxidation state i.e., its
electronic configuration will be: [???? ]3?? 10
. Thus, ????
2+
has no unpaired electrons and it is colourless.
(iv) For a first order reaction, the half-life period (?? 1/2
) is:
(a) Proportional to the initial concentration.
(b) Inversely proportional to the initial concentration.
(c) Proportional to the square root of the initial concentration.
Independent of the initial concentration.
Answer (d)
For a first order reaction, half-life is independent of the initial concentration of the reactant.
?? 1/2
=
0.693
??
Hence, option (D) is the correct answer.
(C) Match the following:
(i) Phenol (a) Hexane + heptane
(ii) EDTA (b) Globular protein
(iii) Ideal solution (c) Azo dye
(iv) Insulin (d) Hexadentate ligand
Answer
(i) Phenol ? (c) Azo dye
(ii) EDTA ? (d) Hexadentate ligand
(iii) Ideal solution ? (a) hexane + heptane
(iv) Insulin ? (b) Globular protein
(D)
(i) Assertion: If a solution contains both ?? +
and ????
+
ions, the ?? +
ions are reduced first at cathode.
Reason: Cations with higher ?? 0
value are reduced first at cathode.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (a)
Reactions at cathode:
?? +
+?? -
?
1
2
?? 2
;?? 0
=0.0 ??
?? ?? +
+?? -
? ???? ; ?? 0
=-2.71 ??
The cations having higher positive reduction potential will be reduced first at the cathode, that’s why ?? +
reduced first at the cathode.
(ii) Assertion: Addition of bromine water to 1-butene gives two optical isomers.
Reason: The product formed contains two asymmetric carbon atoms.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (c)
Addition of bromine water to 1-butene gives two optical isomers as the product contains only one
asymmetric carbon.
Hence, the assertion is true, but reason is false.
SECTION – B
Question 2
Calculate the mass of ascorbic acid (molecular mass = 176 g/mol) that should be dissolved in 155 g of acetic acid
to cause a depression of freezing point by 1.15 K. Assume that ascorbic acid does not dissociate or associate in the
solution.
(?? ?? for acetic acid =3.9 ?? ???? /?????? )
Answer: Depression in freezing point =1.15 ??
As we know, ??? ?? =???? ?? ??
???? ?? =1×3.9×
?? 176×0.155
?
1.15×176×0.155
3.9
=??
i.e. ?? =8.044 ??
Thus, mass of ascorbic acid will be 8.044 ?? .
Question 3
Given a reason for the following:
(i) ????
2+
salts are paramagnetic while ????
+
salts are diamagnetic.
Answer:
????
2+
has one unpaired electron. Therefore, it is paramagnetic. ????
+
has no unpaired electrons. Therefore, it is
diamagnetic.
(ii) ????
2+
compounds are more stable than ????
2+
compounds.
Answer:
????
2+
:1?? 2
,2?? 2
,2?? 6
,3?? 2
,3?? 6
,3?? 5
????
2+
:1?? 2
,2?? 2
,2?? 6
,3?? 2
,3?? 6
,3?? 6
????
2+
compounds are more stable due to half-filled d-orbitals. ????
2+
compounds are comparatively less
stable as they have six electrons in their 3d-orbitals. So, they tend to lose one electron (form ????
3+
) and get
stable 3?? 5
configuration.
Question 4
Given chemical equations for each of the following:
(i) Ethyl chloride is treated with aqueous KOH solution.
Answer: Ethyl chloride undergoes a nucleophilic substitution reaction when treated with aqueous KOH solution &
gives ethanol as a major product.
?? 2
?? 5
???? +???? .?????? ? ?? 2
?? 5
???? +??????
(ii) Chlorobenzene is treated with ammonia at 573 K and high pressure.
Answer: Chlorobenzene on reaction with ammonia at 573 K and high pressure gives aniline as a major product.
?? 6
?? 5
???? +????
3
? ?? 6
?? 5
?? ?? 2
+??????
Question 5
State one reason for each of the following:
(i) Alkylamine is soluble in water whereas arylamine is insoluble in water.
Answer: Lower aliphatic alkylamine is soluble in water owing to their potential to form intermolecular hydrogen
bonds with water. On the other hand, arylamine does not undergo hydrogen bonding because of the
presence of the benzene which is highly hydrophobic. Therefore, arylamine is insoluble in water.
Page 5
Chemistry
ICS Boards 2023
SECTION – A
Question 1
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane,
Rosenmund’s]
(i) The primary alcohols are easily oxidized first into ______ and then into ________.
Answer: The primary alcohols are easily oxidized first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly _______ due to _______ energy.
Answer: The intermediate activated complex in a chemical reaction is highly unstable due to high energy.
(iii) The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are ______ and ______
respectively.
Answer: The coordination number and oxidation state of the complex ?? 4
[???? (???? )
6
] are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. ?? ?? ?? gives _______ and the reaction is
known as ________ reduction.
Answer: Propanone on reaction with zinc amalgam in presence of conc. ?? ?? ?? gives propane and the reaction is
known as Clemmensen’s reduction.
(B) Select and write the correct alternative from the choices given below:
(i) The reaction of a primary amine with chloroform and ethanolic ?????? is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fitting reaction
Answer (a)
Aliphatic or aromatic primary amines on heating with chloroform give foul smelling products called
isocyanides or carbylamines and the reaction is known as carbylamine reaction.
(ii) Which one of the following statements is TRUE for the galvanic cell?
(a) Electrons flow from copper electrode to zinc electrode.
(b) Current flows from zinc electrode to copper electrode
(c) Cations move towards copper electrode.
(d) Cations move towards zinc electrode.
Answer (c)
In Galvanic cell, following reaction occurs:
???? +????
2+
? ????
2+
+????
At anode: ???? ? ????
2+
+2?? -
At cathode: ????
2+
+2?? -
? ????
In this cell, electrons flow from anode to cathode i.e. zinc electrode to copper electrode whereas current
flows from copper electrode to zinc electrode in an external circuit. And cations i.e., ????
2+
ions move
towards the copper electrode.
(iii) Which one of the following compounds is diamagnetic and colourless?
(a) ?? 2
????
2
?? 7
(b) ?????? ?? 4
(c) ?????? ?? 4
(d) ?? ?? 2
(?? ?? 4
)
3
Answer (b)
?????? ?? 4
is a diamagnetic and colourless compound, because here ???? is in +2 oxidation state i.e., its
electronic configuration will be: [???? ]3?? 10
. Thus, ????
2+
has no unpaired electrons and it is colourless.
(iv) For a first order reaction, the half-life period (?? 1/2
) is:
(a) Proportional to the initial concentration.
(b) Inversely proportional to the initial concentration.
(c) Proportional to the square root of the initial concentration.
Independent of the initial concentration.
Answer (d)
For a first order reaction, half-life is independent of the initial concentration of the reactant.
?? 1/2
=
0.693
??
Hence, option (D) is the correct answer.
(C) Match the following:
(i) Phenol (a) Hexane + heptane
(ii) EDTA (b) Globular protein
(iii) Ideal solution (c) Azo dye
(iv) Insulin (d) Hexadentate ligand
Answer
(i) Phenol ? (c) Azo dye
(ii) EDTA ? (d) Hexadentate ligand
(iii) Ideal solution ? (a) hexane + heptane
(iv) Insulin ? (b) Globular protein
(D)
(i) Assertion: If a solution contains both ?? +
and ????
+
ions, the ?? +
ions are reduced first at cathode.
Reason: Cations with higher ?? 0
value are reduced first at cathode.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (a)
Reactions at cathode:
?? +
+?? -
?
1
2
?? 2
;?? 0
=0.0 ??
?? ?? +
+?? -
? ???? ; ?? 0
=-2.71 ??
The cations having higher positive reduction potential will be reduced first at the cathode, that’s why ?? +
reduced first at the cathode.
(ii) Assertion: Addition of bromine water to 1-butene gives two optical isomers.
Reason: The product formed contains two asymmetric carbon atoms.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer (c)
Addition of bromine water to 1-butene gives two optical isomers as the product contains only one
asymmetric carbon.
Hence, the assertion is true, but reason is false.
SECTION – B
Question 2
Calculate the mass of ascorbic acid (molecular mass = 176 g/mol) that should be dissolved in 155 g of acetic acid
to cause a depression of freezing point by 1.15 K. Assume that ascorbic acid does not dissociate or associate in the
solution.
(?? ?? for acetic acid =3.9 ?? ???? /?????? )
Answer: Depression in freezing point =1.15 ??
As we know, ??? ?? =???? ?? ??
???? ?? =1×3.9×
?? 176×0.155
?
1.15×176×0.155
3.9
=??
i.e. ?? =8.044 ??
Thus, mass of ascorbic acid will be 8.044 ?? .
Question 3
Given a reason for the following:
(i) ????
2+
salts are paramagnetic while ????
+
salts are diamagnetic.
Answer:
????
2+
has one unpaired electron. Therefore, it is paramagnetic. ????
+
has no unpaired electrons. Therefore, it is
diamagnetic.
(ii) ????
2+
compounds are more stable than ????
2+
compounds.
Answer:
????
2+
:1?? 2
,2?? 2
,2?? 6
,3?? 2
,3?? 6
,3?? 5
????
2+
:1?? 2
,2?? 2
,2?? 6
,3?? 2
,3?? 6
,3?? 6
????
2+
compounds are more stable due to half-filled d-orbitals. ????
2+
compounds are comparatively less
stable as they have six electrons in their 3d-orbitals. So, they tend to lose one electron (form ????
3+
) and get
stable 3?? 5
configuration.
Question 4
Given chemical equations for each of the following:
(i) Ethyl chloride is treated with aqueous KOH solution.
Answer: Ethyl chloride undergoes a nucleophilic substitution reaction when treated with aqueous KOH solution &
gives ethanol as a major product.
?? 2
?? 5
???? +???? .?????? ? ?? 2
?? 5
???? +??????
(ii) Chlorobenzene is treated with ammonia at 573 K and high pressure.
Answer: Chlorobenzene on reaction with ammonia at 573 K and high pressure gives aniline as a major product.
?? 6
?? 5
???? +????
3
? ?? 6
?? 5
?? ?? 2
+??????
Question 5
State one reason for each of the following:
(i) Alkylamine is soluble in water whereas arylamine is insoluble in water.
Answer: Lower aliphatic alkylamine is soluble in water owing to their potential to form intermolecular hydrogen
bonds with water. On the other hand, arylamine does not undergo hydrogen bonding because of the
presence of the benzene which is highly hydrophobic. Therefore, arylamine is insoluble in water.
(ii) Methylamine is a stronger base than methyl alcohol.
Answer: Methylamine is a stronger base than methyl alcohol. This is because nitrogen in methylamine is less
electronegative than oxygen in methanol. So, methylamine can easily donate a lone pair of electrons to a proton
of an acid.
Question 6
Calculate the emf of the following cell at 298 K.
???? /?? ?? (0.025 ?? )
2+
//????
(0.005?? )
+
/?? ??
Given ?? ?? ?? 2+
/????
0
=0.34?? ,?? ?? ?? +
/????
0
=0.80 ?? ,
1 Faraday- 96500 ?? ?????? -1
Answer:
???? /????
2+
//????
+
/???? ;???????????????? :???? +2????
+
? 2???? +????
2+
?? ????
2+
/????
0
=0.34??
?? ????
+
/????
0
=0.80??
According to Nernst equation:
?? ????????
=?? ???????? 0
-
0.0591
2
??????
[????
2+
]
[????
+
]
2
??? ???????? =(0.80-0.34)-
0.0591
2
??????
0.025
(0.005)
2
??? ???????? =0.46-(
0.0591
2
×3)
??? ???????? =0.371 ??
Question 7
Complete and balance the following chemical equations:
(i) ?????? ?? 4
+?? 2
?? ?? 4
+???? ? _____ + _______ + _______ + _______
(ii) ?? 2
?? ?? 2
?? 7
+?? 2
?? ?? 4
+?? 2
?? ? _______ + _______ + _______ + ________
Answer:
(i) 2KMnO4 + 8H2SO4 + 10KI ? 2MnSO4 + 6K2SO4 + 5I2 + 8H2O
(ii) K2Cr2O7 + 4H2SO4 + 3H2S ? K2SO4 + Cr2(SO4)3 + 3S + 7H2O
Question 8
(i) How will the following be obtained? (Give chemical equation)
a) Ethanol from Grignard's reagent.
b) Diethyl ether from sodium ethoxide.
OR
(ii) An organic compound [A] ?? 2
?? 6
?? , on heating with conc. ?? 2
?? ?? 4
at 413 K gives a neutral compound
[B] ?? 4
?? 10
?? . Compound [B] on treatment with ???? ?? 5
gives a product, which on subsequent
treatment with KCN yields compound [C] ?? 3
?? 5
?? . [A]. [B] [C] and [D] on hydrolysis gives an acid
[D] ?? 3
?? 6
?? 2
. Identify the compounds [A], [B], [C] and [D].
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FAQs on ICSE Chemistry Previous Year Paper with Solution - 2023 - ICSE Class 12 Science Previous Year Papers
| 1. What is the importance of practicing previous year ICSE Chemistry papers for Class 12 students? |  |
Ans. Practicing previous year ICSE Chemistry papers is crucial for Class 12 students as it helps them understand the exam pattern, question types, and marking scheme. It also allows students to assess their preparation level, identify weak areas, and improve time management skills during the exam. Familiarity with past questions can boost confidence and enhance problem-solving abilities.
| 2. How can students effectively utilize the solutions provided for ICSE Chemistry previous year papers? | |
Ans. Students can utilize the solutions for ICSE Chemistry previous year papers by first attempting to solve the questions independently. Afterward, they should refer to the provided solutions to check their answers and understand the correct approach. This process helps in identifying conceptual gaps, reinforces learning, and develops a clearer understanding of the subject matter.
| 3. What types of questions are commonly found in ICSE Class 12 Chemistry exams? | |
Ans. The ICSE Class 12 Chemistry exams typically include a variety of question types such as theoretical questions, numerical problems, and laboratory-based questions. Common topics cover organic chemistry, physical chemistry, inorganic chemistry, and analytical chemistry. Students may encounter multiple-choice questions, short answer questions, and long answer questions that assess both conceptual understanding and practical application.
| 4. What are some effective study strategies for excelling in ICSE Chemistry Class 12 exams? | |
Ans. Effective study strategies for excelling in ICSE Chemistry Class 12 exams include creating a structured study plan, breaking down the syllabus into manageable sections, and regularly reviewing key concepts. Utilizing visual aids like charts and diagrams, practicing with previous year papers, and conducting group study sessions can enhance understanding. Engaging in hands-on experiments and seeking help from teachers or peers when needed also contributes to better preparation.
| 5. How does the ICSE Chemistry syllabus for Class 12 differ from that of Class 10? | |
Ans. The ICSE Chemistry syllabus for Class 12 is more advanced and covers a broader range of topics compared to Class 10. It includes in-depth study of organic compounds, chemical kinetics, thermodynamics, and electrochemistry, among others. Additionally, Class 12 requires students to apply concepts in more complex ways and involves greater emphasis on practical experiments and analytical techniques, preparing them for higher studies in science.
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