ICSE Class 10 Chemistry Sample Paper 2025 - 2 | Chemistry Class 10 ICSE PDF Download

 Page 1


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) He b) Xe
c) Ar d) Ne
The element with the highest ionisation potential in the periodic table is ________. [1] (a)
a) decreases b) depends on the number of valence
electrons
c) increases d) remains the same
The electronegativity on moving from left to right in a period [1] (b)
a) LP, R
2
L, P
2
Q, RQ b) L
2
P, RL, PQ, R
2
Q
c) P
2
L, RL, PO, RQ
2
d) LP, RL, PQ, RQ
The electronic configurations of four elements 
L : 1s
2
2s
2
2p
4
 
Q : 1s
2
2s
2
2p
6
3s
2
3p
5
 
P : 1s
2
2s
2
2p
6
3s
1
 
R : 1s
2
2s
2
2p
6
3s
2
 
The formulae of ionic compounds that can be formed between them are 
[1] (c)
a) Wash the hand immediately with plenty
of water and apply a paste of sodium
hydrogen carbonate
b) After washing with plenty of water
apply solution of sodium hydroxide on
the hand
If few drops of a concentrated acid accidentally spills over the hand of a student, what should be
done?
[1] (d)
Chemistry
Page 2


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) He b) Xe
c) Ar d) Ne
The element with the highest ionisation potential in the periodic table is ________. [1] (a)
a) decreases b) depends on the number of valence
electrons
c) increases d) remains the same
The electronegativity on moving from left to right in a period [1] (b)
a) LP, R
2
L, P
2
Q, RQ b) L
2
P, RL, PQ, R
2
Q
c) P
2
L, RL, PO, RQ
2
d) LP, RL, PQ, RQ
The electronic configurations of four elements 
L : 1s
2
2s
2
2p
4
 
Q : 1s
2
2s
2
2p
6
3s
2
3p
5
 
P : 1s
2
2s
2
2p
6
3s
1
 
R : 1s
2
2s
2
2p
6
3s
2
 
The formulae of ionic compounds that can be formed between them are 
[1] (c)
a) Wash the hand immediately with plenty
of water and apply a paste of sodium
hydrogen carbonate
b) After washing with plenty of water
apply solution of sodium hydroxide on
the hand
If few drops of a concentrated acid accidentally spills over the hand of a student, what should be
done?
[1] (d)
Chemistry
c) Wash the hand with saline solution d) Neutralise the acid with a strong alkali
a) concentrated hydrochloric acid and
dilute nitric acid
b) dilute hydrochloric acid and
concentrated nitric acid
c) concentrated hydrochloric acid (3 parts)
and concentrated nitric acid (1 part)
d) concentrated hydrochloric acid (1 part)
and concentrated nitric acid (3 parts)
Aqua regia is a mixture of: [1] (e)
a) Silver b) Copper
c) Magnesium d) Lead
Hydroxide of this metal is soluble in sodium hydroxide solution: [1] (f)
a) ozone b) phosphorus
c) oxygen d) helium
The element which has two atoms in its molecule is [1] (g)
a) CHO
2
b) C
2
H
2
O
2
c) CH
2
O d) C
2
HO
What will be the empirical formula of CH
3
COOH? [1] (h)
a) only molecules b) only atoms
c) mainly ions d) ions and molecules
The particles present in strong electrolytes are: [1] (i)
a) 22 parts gold mixed with 2 parts of Cu
or Ag
b) 22 parts gold mixed with 3 parts of Zn
c) 22 parts of gold only d) 22 parts gold mixed with 2 parts of Al
What does 22 carat gold means? [1] (j)
a) greater diffusion of HCl than NH
3
b) formation of NH
4
OH and HCl
c) greater diffusion of NH
3
 than HCl d) formation of NH
3
 and HCl
NH
4
Cl(s) is heated in a test tube. Vapours are brought in contact with red litmus paper, which changes
to blue and then to red. It is because of
[1] (k)
a) CO
2
 and NH
3
b) SO
2
 and SO
3
c) CO
2
 and SO
3
d) SO
2
 and CO
2
Select the pair of gases which turn lime water milky: [1] (l)
a) Reduction of CH
3
COOH with HI/P
4
b) Reduction of CH
3
COCH
3
 with Hl/P
4
c) Sodalime decarboxylation of sodium
propionate
d) Hydrogenation of ethane in the
presence of Ni
Which of the following reactions will not produce ethane? [1] (m)
The functional group present in acetic acid is: [1] (n)
Page 3


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) He b) Xe
c) Ar d) Ne
The element with the highest ionisation potential in the periodic table is ________. [1] (a)
a) decreases b) depends on the number of valence
electrons
c) increases d) remains the same
The electronegativity on moving from left to right in a period [1] (b)
a) LP, R
2
L, P
2
Q, RQ b) L
2
P, RL, PQ, R
2
Q
c) P
2
L, RL, PO, RQ
2
d) LP, RL, PQ, RQ
The electronic configurations of four elements 
L : 1s
2
2s
2
2p
4
 
Q : 1s
2
2s
2
2p
6
3s
2
3p
5
 
P : 1s
2
2s
2
2p
6
3s
1
 
R : 1s
2
2s
2
2p
6
3s
2
 
The formulae of ionic compounds that can be formed between them are 
[1] (c)
a) Wash the hand immediately with plenty
of water and apply a paste of sodium
hydrogen carbonate
b) After washing with plenty of water
apply solution of sodium hydroxide on
the hand
If few drops of a concentrated acid accidentally spills over the hand of a student, what should be
done?
[1] (d)
Chemistry
c) Wash the hand with saline solution d) Neutralise the acid with a strong alkali
a) concentrated hydrochloric acid and
dilute nitric acid
b) dilute hydrochloric acid and
concentrated nitric acid
c) concentrated hydrochloric acid (3 parts)
and concentrated nitric acid (1 part)
d) concentrated hydrochloric acid (1 part)
and concentrated nitric acid (3 parts)
Aqua regia is a mixture of: [1] (e)
a) Silver b) Copper
c) Magnesium d) Lead
Hydroxide of this metal is soluble in sodium hydroxide solution: [1] (f)
a) ozone b) phosphorus
c) oxygen d) helium
The element which has two atoms in its molecule is [1] (g)
a) CHO
2
b) C
2
H
2
O
2
c) CH
2
O d) C
2
HO
What will be the empirical formula of CH
3
COOH? [1] (h)
a) only molecules b) only atoms
c) mainly ions d) ions and molecules
The particles present in strong electrolytes are: [1] (i)
a) 22 parts gold mixed with 2 parts of Cu
or Ag
b) 22 parts gold mixed with 3 parts of Zn
c) 22 parts of gold only d) 22 parts gold mixed with 2 parts of Al
What does 22 carat gold means? [1] (j)
a) greater diffusion of HCl than NH
3
b) formation of NH
4
OH and HCl
c) greater diffusion of NH
3
 than HCl d) formation of NH
3
 and HCl
NH
4
Cl(s) is heated in a test tube. Vapours are brought in contact with red litmus paper, which changes
to blue and then to red. It is because of
[1] (k)
a) CO
2
 and NH
3
b) SO
2
 and SO
3
c) CO
2
 and SO
3
d) SO
2
 and CO
2
Select the pair of gases which turn lime water milky: [1] (l)
a) Reduction of CH
3
COOH with HI/P
4
b) Reduction of CH
3
COCH
3
 with Hl/P
4
c) Sodalime decarboxylation of sodium
propionate
d) Hydrogenation of ethane in the
presence of Ni
Which of the following reactions will not produce ethane? [1] (m)
The functional group present in acetic acid is: [1] (n)
a) Hydroxyl -OH b) Carboxyl -COOH
c)
Ketonic  = O
d) Aldehydic -CHO
a) Acetaldehyde b) Acetone
c) Acetalhyde d) Acetic acid
What will be the final oxidation product of ethyl alcohol? [1] (o)
2. Question 2 [25]
Complete and balance the following equations.
i. KNO
3
 + H
2
SO
4
 (conc.)  ________ + ________
ii. 2Cu(NO
3
)
2
  ________ + ________ + ________
iii. KOH + HNO
3
  ________ + ________
iv. P + 5HNO
3
  ________ + ________ + ________
v. C + 4HNO
3
  ________ + ________ + ________
[5] (a)
- ? - - C 2 0 0 ° - ? ? ? ? ? Match the gases given in column I to the identification of the gases mentioned in column II.
Column I Column II
(a) Hydrogen sulphide (i) Turns acidified potassium dichromate solution green
(b) Nitric oxide (ii) Turns lime water milky
(c) Carbon dioxide (iii) Turns reddish brown when it reacts with oxygen
(d) Sulphur dioxide (iv) Turns moist lead acetate paper silvery black
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. The energy required to remove an electron from a neutral isolated gaseous atom and convert it
into a positively charged gaseous ion is called ________. (electron affinity/ionisation
potential/electronegativity)
[1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. The number of moles in 11 gm of nitrogen gas is ________. (0.39/0.49/0.29) 
[Atomic mass of N = 14]
[1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Quicklime is not used to dry HCl gas because ________ (CaO is alkaline/CaO is acidic/CaO is
neutral).
[1]
(c)
Identify the following:
i. The property by which carbon compounds with itself to form a long chain. [1]
ii. The gas evolved when hydrochloric acid is added to manganese(IV) oxide. [1]
iii. The electrolytic deposition of a superior metal on a base plate. [1]
iv. The base which is soluble in water. [1]
v. The properties of the elements are a periodic function of their ________. (atomic number/mass
number/relative atomic mass)
[1]
(d)
Page 4


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) He b) Xe
c) Ar d) Ne
The element with the highest ionisation potential in the periodic table is ________. [1] (a)
a) decreases b) depends on the number of valence
electrons
c) increases d) remains the same
The electronegativity on moving from left to right in a period [1] (b)
a) LP, R
2
L, P
2
Q, RQ b) L
2
P, RL, PQ, R
2
Q
c) P
2
L, RL, PO, RQ
2
d) LP, RL, PQ, RQ
The electronic configurations of four elements 
L : 1s
2
2s
2
2p
4
 
Q : 1s
2
2s
2
2p
6
3s
2
3p
5
 
P : 1s
2
2s
2
2p
6
3s
1
 
R : 1s
2
2s
2
2p
6
3s
2
 
The formulae of ionic compounds that can be formed between them are 
[1] (c)
a) Wash the hand immediately with plenty
of water and apply a paste of sodium
hydrogen carbonate
b) After washing with plenty of water
apply solution of sodium hydroxide on
the hand
If few drops of a concentrated acid accidentally spills over the hand of a student, what should be
done?
[1] (d)
Chemistry
c) Wash the hand with saline solution d) Neutralise the acid with a strong alkali
a) concentrated hydrochloric acid and
dilute nitric acid
b) dilute hydrochloric acid and
concentrated nitric acid
c) concentrated hydrochloric acid (3 parts)
and concentrated nitric acid (1 part)
d) concentrated hydrochloric acid (1 part)
and concentrated nitric acid (3 parts)
Aqua regia is a mixture of: [1] (e)
a) Silver b) Copper
c) Magnesium d) Lead
Hydroxide of this metal is soluble in sodium hydroxide solution: [1] (f)
a) ozone b) phosphorus
c) oxygen d) helium
The element which has two atoms in its molecule is [1] (g)
a) CHO
2
b) C
2
H
2
O
2
c) CH
2
O d) C
2
HO
What will be the empirical formula of CH
3
COOH? [1] (h)
a) only molecules b) only atoms
c) mainly ions d) ions and molecules
The particles present in strong electrolytes are: [1] (i)
a) 22 parts gold mixed with 2 parts of Cu
or Ag
b) 22 parts gold mixed with 3 parts of Zn
c) 22 parts of gold only d) 22 parts gold mixed with 2 parts of Al
What does 22 carat gold means? [1] (j)
a) greater diffusion of HCl than NH
3
b) formation of NH
4
OH and HCl
c) greater diffusion of NH
3
 than HCl d) formation of NH
3
 and HCl
NH
4
Cl(s) is heated in a test tube. Vapours are brought in contact with red litmus paper, which changes
to blue and then to red. It is because of
[1] (k)
a) CO
2
 and NH
3
b) SO
2
 and SO
3
c) CO
2
 and SO
3
d) SO
2
 and CO
2
Select the pair of gases which turn lime water milky: [1] (l)
a) Reduction of CH
3
COOH with HI/P
4
b) Reduction of CH
3
COCH
3
 with Hl/P
4
c) Sodalime decarboxylation of sodium
propionate
d) Hydrogenation of ethane in the
presence of Ni
Which of the following reactions will not produce ethane? [1] (m)
The functional group present in acetic acid is: [1] (n)
a) Hydroxyl -OH b) Carboxyl -COOH
c)
Ketonic  = O
d) Aldehydic -CHO
a) Acetaldehyde b) Acetone
c) Acetalhyde d) Acetic acid
What will be the final oxidation product of ethyl alcohol? [1] (o)
2. Question 2 [25]
Complete and balance the following equations.
i. KNO
3
 + H
2
SO
4
 (conc.)  ________ + ________
ii. 2Cu(NO
3
)
2
  ________ + ________ + ________
iii. KOH + HNO
3
  ________ + ________
iv. P + 5HNO
3
  ________ + ________ + ________
v. C + 4HNO
3
  ________ + ________ + ________
[5] (a)
- ? - - C 2 0 0 ° - ? ? ? ? ? Match the gases given in column I to the identification of the gases mentioned in column II.
Column I Column II
(a) Hydrogen sulphide (i) Turns acidified potassium dichromate solution green
(b) Nitric oxide (ii) Turns lime water milky
(c) Carbon dioxide (iii) Turns reddish brown when it reacts with oxygen
(d) Sulphur dioxide (iv) Turns moist lead acetate paper silvery black
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. The energy required to remove an electron from a neutral isolated gaseous atom and convert it
into a positively charged gaseous ion is called ________. (electron affinity/ionisation
potential/electronegativity)
[1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. The number of moles in 11 gm of nitrogen gas is ________. (0.39/0.49/0.29) 
[Atomic mass of N = 14]
[1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Quicklime is not used to dry HCl gas because ________ (CaO is alkaline/CaO is acidic/CaO is
neutral).
[1]
(c)
Identify the following:
i. The property by which carbon compounds with itself to form a long chain. [1]
ii. The gas evolved when hydrochloric acid is added to manganese(IV) oxide. [1]
iii. The electrolytic deposition of a superior metal on a base plate. [1]
iv. The base which is soluble in water. [1]
v. The properties of the elements are a periodic function of their ________. (atomic number/mass
number/relative atomic mass)
[1]
(d)
Section B
Attempt any 4 questions
i. i. State the volume occupied by 40 gm of methane at STP, if its vapour density (V.D.) is 8.
ii. Calculate the number of moles present in 160 gm of NaOH. 
[Atomic mass: Na = 23, H = 1, O = 16].
[2]
ii. Elements X, Y and Z have atomic number 6, 9 and 12 respectively. Which:
i. forms an anion?
ii. forms a cation?
iii. has four electrons in its valence shell?
[3]
(e)
3. Question 3 [10]
State one chemical test to distinguish between each of the following pairs - 
Manganese dioxide and Copper (II) oxide.
[2] (a)
Write the products and balance the equation.
i. Sodium sulphate using dilute sulphuric acid. [1]
ii. Ammonium sulphate crystals. [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Cs, Na, Li, K, Rb (increasing order of metallic character) [1]
ii. F, B, N, O (In the increasing order of electron affinity) [1]
iii. K, Pb, Ca, Zn (In the increasing order of the reactivity) [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. ________ is also known as wood spirit. (methanol/ethanol/propanol). [1]
ii. ________ was the first organic compound prepared in laboratory. [1]
iii. CH
2
O is an ________ for the molecular formula, C
6
H
12
O
6
. [1]
(d)
4. Question 4 [10]
Explain the bonding in methane molecule using electron dot structure. [2] (a)
Calculate the volume of 320 g of SO
2
 at STP. 
[Atomic mass of S = 32 and O = 16]
[2] (b)
Bayer's process is used to concentrate bauxite to alumina. Give balanced chemical equations for the
reaction taking place for its conversion from bauxite to alumina.
[3] (c)
Explain the following:
i. Aluminium is more abundant than gold in the earth's crust, yet it is gold and not aluminium
that has been known to man since ancient times.
[1]
ii. Zinc chloride is stored in air-tight bottles. [1]
iii. An aqueous solution of sodium chloride conducts electricity. [1]
(d)
5. Question 5 [10]
i. What are the main types (groups) of aliphatic hydrocarbons? [1]
ii. Define Homologous series [1]
(a)
Explain, polar covalent bond with the help of suitable example. [2] (b)
Give balanced chemical equation for the following:
i. Lead nitrate is heated in a dry test tube [1]
(c)
Page 5


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) He b) Xe
c) Ar d) Ne
The element with the highest ionisation potential in the periodic table is ________. [1] (a)
a) decreases b) depends on the number of valence
electrons
c) increases d) remains the same
The electronegativity on moving from left to right in a period [1] (b)
a) LP, R
2
L, P
2
Q, RQ b) L
2
P, RL, PQ, R
2
Q
c) P
2
L, RL, PO, RQ
2
d) LP, RL, PQ, RQ
The electronic configurations of four elements 
L : 1s
2
2s
2
2p
4
 
Q : 1s
2
2s
2
2p
6
3s
2
3p
5
 
P : 1s
2
2s
2
2p
6
3s
1
 
R : 1s
2
2s
2
2p
6
3s
2
 
The formulae of ionic compounds that can be formed between them are 
[1] (c)
a) Wash the hand immediately with plenty
of water and apply a paste of sodium
hydrogen carbonate
b) After washing with plenty of water
apply solution of sodium hydroxide on
the hand
If few drops of a concentrated acid accidentally spills over the hand of a student, what should be
done?
[1] (d)
Chemistry
c) Wash the hand with saline solution d) Neutralise the acid with a strong alkali
a) concentrated hydrochloric acid and
dilute nitric acid
b) dilute hydrochloric acid and
concentrated nitric acid
c) concentrated hydrochloric acid (3 parts)
and concentrated nitric acid (1 part)
d) concentrated hydrochloric acid (1 part)
and concentrated nitric acid (3 parts)
Aqua regia is a mixture of: [1] (e)
a) Silver b) Copper
c) Magnesium d) Lead
Hydroxide of this metal is soluble in sodium hydroxide solution: [1] (f)
a) ozone b) phosphorus
c) oxygen d) helium
The element which has two atoms in its molecule is [1] (g)
a) CHO
2
b) C
2
H
2
O
2
c) CH
2
O d) C
2
HO
What will be the empirical formula of CH
3
COOH? [1] (h)
a) only molecules b) only atoms
c) mainly ions d) ions and molecules
The particles present in strong electrolytes are: [1] (i)
a) 22 parts gold mixed with 2 parts of Cu
or Ag
b) 22 parts gold mixed with 3 parts of Zn
c) 22 parts of gold only d) 22 parts gold mixed with 2 parts of Al
What does 22 carat gold means? [1] (j)
a) greater diffusion of HCl than NH
3
b) formation of NH
4
OH and HCl
c) greater diffusion of NH
3
 than HCl d) formation of NH
3
 and HCl
NH
4
Cl(s) is heated in a test tube. Vapours are brought in contact with red litmus paper, which changes
to blue and then to red. It is because of
[1] (k)
a) CO
2
 and NH
3
b) SO
2
 and SO
3
c) CO
2
 and SO
3
d) SO
2
 and CO
2
Select the pair of gases which turn lime water milky: [1] (l)
a) Reduction of CH
3
COOH with HI/P
4
b) Reduction of CH
3
COCH
3
 with Hl/P
4
c) Sodalime decarboxylation of sodium
propionate
d) Hydrogenation of ethane in the
presence of Ni
Which of the following reactions will not produce ethane? [1] (m)
The functional group present in acetic acid is: [1] (n)
a) Hydroxyl -OH b) Carboxyl -COOH
c)
Ketonic  = O
d) Aldehydic -CHO
a) Acetaldehyde b) Acetone
c) Acetalhyde d) Acetic acid
What will be the final oxidation product of ethyl alcohol? [1] (o)
2. Question 2 [25]
Complete and balance the following equations.
i. KNO
3
 + H
2
SO
4
 (conc.)  ________ + ________
ii. 2Cu(NO
3
)
2
  ________ + ________ + ________
iii. KOH + HNO
3
  ________ + ________
iv. P + 5HNO
3
  ________ + ________ + ________
v. C + 4HNO
3
  ________ + ________ + ________
[5] (a)
- ? - - C 2 0 0 ° - ? ? ? ? ? Match the gases given in column I to the identification of the gases mentioned in column II.
Column I Column II
(a) Hydrogen sulphide (i) Turns acidified potassium dichromate solution green
(b) Nitric oxide (ii) Turns lime water milky
(c) Carbon dioxide (iii) Turns reddish brown when it reacts with oxygen
(d) Sulphur dioxide (iv) Turns moist lead acetate paper silvery black
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. The energy required to remove an electron from a neutral isolated gaseous atom and convert it
into a positively charged gaseous ion is called ________. (electron affinity/ionisation
potential/electronegativity)
[1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. The number of moles in 11 gm of nitrogen gas is ________. (0.39/0.49/0.29) 
[Atomic mass of N = 14]
[1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Quicklime is not used to dry HCl gas because ________ (CaO is alkaline/CaO is acidic/CaO is
neutral).
[1]
(c)
Identify the following:
i. The property by which carbon compounds with itself to form a long chain. [1]
ii. The gas evolved when hydrochloric acid is added to manganese(IV) oxide. [1]
iii. The electrolytic deposition of a superior metal on a base plate. [1]
iv. The base which is soluble in water. [1]
v. The properties of the elements are a periodic function of their ________. (atomic number/mass
number/relative atomic mass)
[1]
(d)
Section B
Attempt any 4 questions
i. i. State the volume occupied by 40 gm of methane at STP, if its vapour density (V.D.) is 8.
ii. Calculate the number of moles present in 160 gm of NaOH. 
[Atomic mass: Na = 23, H = 1, O = 16].
[2]
ii. Elements X, Y and Z have atomic number 6, 9 and 12 respectively. Which:
i. forms an anion?
ii. forms a cation?
iii. has four electrons in its valence shell?
[3]
(e)
3. Question 3 [10]
State one chemical test to distinguish between each of the following pairs - 
Manganese dioxide and Copper (II) oxide.
[2] (a)
Write the products and balance the equation.
i. Sodium sulphate using dilute sulphuric acid. [1]
ii. Ammonium sulphate crystals. [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Cs, Na, Li, K, Rb (increasing order of metallic character) [1]
ii. F, B, N, O (In the increasing order of electron affinity) [1]
iii. K, Pb, Ca, Zn (In the increasing order of the reactivity) [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. ________ is also known as wood spirit. (methanol/ethanol/propanol). [1]
ii. ________ was the first organic compound prepared in laboratory. [1]
iii. CH
2
O is an ________ for the molecular formula, C
6
H
12
O
6
. [1]
(d)
4. Question 4 [10]
Explain the bonding in methane molecule using electron dot structure. [2] (a)
Calculate the volume of 320 g of SO
2
 at STP. 
[Atomic mass of S = 32 and O = 16]
[2] (b)
Bayer's process is used to concentrate bauxite to alumina. Give balanced chemical equations for the
reaction taking place for its conversion from bauxite to alumina.
[3] (c)
Explain the following:
i. Aluminium is more abundant than gold in the earth's crust, yet it is gold and not aluminium
that has been known to man since ancient times.
[1]
ii. Zinc chloride is stored in air-tight bottles. [1]
iii. An aqueous solution of sodium chloride conducts electricity. [1]
(d)
5. Question 5 [10]
i. What are the main types (groups) of aliphatic hydrocarbons? [1]
ii. Define Homologous series [1]
(a)
Explain, polar covalent bond with the help of suitable example. [2] (b)
Give balanced chemical equation for the following:
i. Lead nitrate is heated in a dry test tube [1]
(c)
ii. Magnesium sulphate solution is mixed with barium chloride solution [1]
iii. Action of dilute sulphuric acid on sodium sulphite [1]
State one relevant observation for each of the following reactions:
i. Barium chloride solution is slowly added to sodium sulphate solution. [1]
ii. Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and
then in excess.
[1]
iii. In the electrolyte during the electrolysis of copper sulphate solutions with inert electrodes. [1]
(d)
6. Question 6 [10]
An element Z has atomic number 16. Answer the following questions.
i. State the period and group to which Z belongs.
ii. Is Z a metal or a non-metal?
[2] (a)
Find the number of moles and molecules present in 7.1 g of Cl
2
. (At. Wt. Cl = 35.5) [2] (b)
Give the common name of
i. ethanol
ii. ethoxyethane
iii. ethanoic acid
[3] (c)
Distinguish between the following pairs of compounds using the test given within the brackets.
i. Calcium sulphite and calcium carbonate (using dil. HCl).
ii. Calcium nitrate and potassium nitrate (using a flame test).
iii. Lead nitrate solution and Zinc nitrate solution (using an alkali).
[3] (d)
7. Question 7 [10]
What is the essential difference in the nature of compounds when two combining atoms?
i. differ much in their electronegativities?
ii. don't differ much in their electronegativities?
[2] (a)
If the empirical formula of a compound is CH and it has a vapour density of 13, find the molecular
formula of the compound.
[2] (b)
Identify the following reactions as either oxidation or reduction.
i. 
ii. 
iii. 
[3] (c)
O + 2 ? e - O 2 - K ? + K + e - + ? F e 3 + e - F e 2 + Write the IUPAC name of the following compounds:
i. Ethyl alcohol
ii. Formaldehyde
iii. Acetaldehyde
iv. Acetic acid
[3] (d)
8. Question 8 [10]
Show the formation of covalent bonds in
i. oxygen
ii. nitrogen molecule by dot diagram.
[2] (a)
If 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the [2] (b)