Sample Question Paper 5 - Chemistry, Class 12 NEET Notes | EduRev

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NEET : Sample Question Paper 5 - Chemistry, Class 12 NEET Notes | EduRev

 Page 1


  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
CBSE 
Class XII Chemistry 
Sample Paper 5 
 
Time: 3 Hrs                                                                              Total Marks: 70 
_________________________________________________________________________________________________________ 
General Instructions: 
? All questions are compulsory.  
? Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.  
? Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.  
? Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.  
? Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.  
? There is no overall choice. However, an internal choice has been provided in two 
questions of one mark, two questions of two marks, four questions of three marks and 
all the three questions of five marks weightage. You have to attempt only one of the 
choices in such questions.  
? Use log tables if necessary. Use of a calculator is not allowed.  
 
Section A 
1. Refractive index of a solid is observed to have the same value along all directions. 
Comment on the nature of this solid.              [1] 
OR 
       What are the coordination numbers of hcp and ccp? 
 
2. A finely divided substance is more effective as an absorbent. Why?          [1] 
 
3. Write any one use of pyrophoric alloys.                              [1] 
OR 
       Write the formula of the compound where the transition metal is in the +7 oxidation 
state. 
 
4. Give the IUPAC name of                [1]  
                                                                 
 
5. Write the monomer units of bakelite.               [1] 
 
Section B 
 
6. An antifreeze solution is prepared from 222.6 g of ethylene glycol  and 200 
g of water. Calculate the molality of the solution. If the density of the solution is
, calculate its molarity.               [2] 
]
2 4 2
[C H (OH)
-1
1.072gmL
Page 2


  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
CBSE 
Class XII Chemistry 
Sample Paper 5 
 
Time: 3 Hrs                                                                              Total Marks: 70 
_________________________________________________________________________________________________________ 
General Instructions: 
? All questions are compulsory.  
? Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.  
? Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.  
? Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.  
? Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.  
? There is no overall choice. However, an internal choice has been provided in two 
questions of one mark, two questions of two marks, four questions of three marks and 
all the three questions of five marks weightage. You have to attempt only one of the 
choices in such questions.  
? Use log tables if necessary. Use of a calculator is not allowed.  
 
Section A 
1. Refractive index of a solid is observed to have the same value along all directions. 
Comment on the nature of this solid.              [1] 
OR 
       What are the coordination numbers of hcp and ccp? 
 
2. A finely divided substance is more effective as an absorbent. Why?          [1] 
 
3. Write any one use of pyrophoric alloys.                              [1] 
OR 
       Write the formula of the compound where the transition metal is in the +7 oxidation 
state. 
 
4. Give the IUPAC name of                [1]  
                                                                 
 
5. Write the monomer units of bakelite.               [1] 
 
Section B 
 
6. An antifreeze solution is prepared from 222.6 g of ethylene glycol  and 200 
g of water. Calculate the molality of the solution. If the density of the solution is
, calculate its molarity.               [2] 
]
2 4 2
[C H (OH)
-1
1.072gmL
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
OR 
 
       Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic 
acid to lower its melting point by 1.5
°
C. (Kf = 3.9 K kg mol
-1
) 
 
7. Calculate the equilibrium constant for the following reaction at 298 K.          [2] 
(s) 2(g) 2(aq)
Cu Cl CuCl ? ? ? ? (R = 8.314 J/K mol) 
02
0
12
2
1
E Cu / Cu 0.34V
E Cl / Cl 1.36V
1F 96500 Cmol
?
?
?
?
?
?
 
 
 
8. For a certain chemical reaction, variation in concentration ln [R] vs  time (s) plot is 
given below:                 [2]                       
  
 
(a) What are the units of the rate constant k? 
(b) What does the slope of the graph indicate?             
  
 
9. Give reason for the following:                                                         [2] 
(a) CN
-
 ion is known, but CP
-
 ion is not known. 
(b) NO2 dimerises to form N2O5. 
(c) ICl is more reactive than I2. 
  
 
10.  Account for the following:                                                                                                                 [2]                       
        (a) Nitration of aniline gives a substantial amount of m-nitroaniline. 
        (b) pKb of aniline is more than that of methylamine.          
 
OR 
 
        (a) Why do primary amines have higher boiling points than tertiary amines?                [2]                       
        (b) Identify A and B. 
Page 3


  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
CBSE 
Class XII Chemistry 
Sample Paper 5 
 
Time: 3 Hrs                                                                              Total Marks: 70 
_________________________________________________________________________________________________________ 
General Instructions: 
? All questions are compulsory.  
? Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.  
? Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.  
? Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.  
? Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.  
? There is no overall choice. However, an internal choice has been provided in two 
questions of one mark, two questions of two marks, four questions of three marks and 
all the three questions of five marks weightage. You have to attempt only one of the 
choices in such questions.  
? Use log tables if necessary. Use of a calculator is not allowed.  
 
Section A 
1. Refractive index of a solid is observed to have the same value along all directions. 
Comment on the nature of this solid.              [1] 
OR 
       What are the coordination numbers of hcp and ccp? 
 
2. A finely divided substance is more effective as an absorbent. Why?          [1] 
 
3. Write any one use of pyrophoric alloys.                              [1] 
OR 
       Write the formula of the compound where the transition metal is in the +7 oxidation 
state. 
 
4. Give the IUPAC name of                [1]  
                                                                 
 
5. Write the monomer units of bakelite.               [1] 
 
Section B 
 
6. An antifreeze solution is prepared from 222.6 g of ethylene glycol  and 200 
g of water. Calculate the molality of the solution. If the density of the solution is
, calculate its molarity.               [2] 
]
2 4 2
[C H (OH)
-1
1.072gmL
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
OR 
 
       Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic 
acid to lower its melting point by 1.5
°
C. (Kf = 3.9 K kg mol
-1
) 
 
7. Calculate the equilibrium constant for the following reaction at 298 K.          [2] 
(s) 2(g) 2(aq)
Cu Cl CuCl ? ? ? ? (R = 8.314 J/K mol) 
02
0
12
2
1
E Cu / Cu 0.34V
E Cl / Cl 1.36V
1F 96500 Cmol
?
?
?
?
?
?
 
 
 
8. For a certain chemical reaction, variation in concentration ln [R] vs  time (s) plot is 
given below:                 [2]                       
  
 
(a) What are the units of the rate constant k? 
(b) What does the slope of the graph indicate?             
  
 
9. Give reason for the following:                                                         [2] 
(a) CN
-
 ion is known, but CP
-
 ion is not known. 
(b) NO2 dimerises to form N2O5. 
(c) ICl is more reactive than I2. 
  
 
10.  Account for the following:                                                                                                                 [2]                       
        (a) Nitration of aniline gives a substantial amount of m-nitroaniline. 
        (b) pKb of aniline is more than that of methylamine.          
 
OR 
 
        (a) Why do primary amines have higher boiling points than tertiary amines?                [2]                       
        (b) Identify A and B. 
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
 
11. Arrange the following compounds in increasing order of their reactivity in nucleophilic 
addition reactions.                                              [2] 
(a) Ethanal, Propanal, Propanone, Butanone 
(b) Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone. 
 
12.                                                                [2] 
(a) What are biodegradable polymers? Give an example.                                
(b) In which classes, the polymers are classified on the basis of molecular forces?                                                                                                                   
 
Section C 
13.                                                           [3] 
(a) What is the co-ordination number of each sphere in the bcc structure?   
(b) What is the formula of a crystalline compound in which atoms of A are present in all 
eight corners and atoms of B at the centre of all six faces? 
(c) Give an example of a compound of groups 12–16.                       
 
14. 2 g of  dissolved in 25 g of benzene shows a depression in freezing point 
equal to 1.62 K. Molal depression constant for benzene is 4.9 K kg mol
-1
. What is the 
percentage association of acetic acid if it forms a dimer solution?             [3] 
 
15. Dissociation of in the gas phase is a first-order reaction with rate constant 
 at 600 K. Calculate the percentage of  that would remain after 200 
min of reaction time.    
OR 
 
A reaction  is a single step reversible reaction. The energy of activation 
for the forward reaction is 38.9 kJ and that of the backward reaction is   
Draw the energy level diagram indicating . 
 
16. Explain the word with suitable examples:                            [3] 
(a) Alcosol 
(b) Aerosol 
(c) Hydrosol 
 
17.                                                                      [3] 
(a) Explain why pine oil is used in the froth flotation process. 
(b) Define collectors.                              
                               
OR 
65
C H COOH
22
SO Cl
-5 -1
2.3×10 s
22
SO Cl
A + B C + D
51.8kJ.
? ? ? ?
E f , E b & ?H
aa
Page 4


  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
CBSE 
Class XII Chemistry 
Sample Paper 5 
 
Time: 3 Hrs                                                                              Total Marks: 70 
_________________________________________________________________________________________________________ 
General Instructions: 
? All questions are compulsory.  
? Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.  
? Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.  
? Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.  
? Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.  
? There is no overall choice. However, an internal choice has been provided in two 
questions of one mark, two questions of two marks, four questions of three marks and 
all the three questions of five marks weightage. You have to attempt only one of the 
choices in such questions.  
? Use log tables if necessary. Use of a calculator is not allowed.  
 
Section A 
1. Refractive index of a solid is observed to have the same value along all directions. 
Comment on the nature of this solid.              [1] 
OR 
       What are the coordination numbers of hcp and ccp? 
 
2. A finely divided substance is more effective as an absorbent. Why?          [1] 
 
3. Write any one use of pyrophoric alloys.                              [1] 
OR 
       Write the formula of the compound where the transition metal is in the +7 oxidation 
state. 
 
4. Give the IUPAC name of                [1]  
                                                                 
 
5. Write the monomer units of bakelite.               [1] 
 
Section B 
 
6. An antifreeze solution is prepared from 222.6 g of ethylene glycol  and 200 
g of water. Calculate the molality of the solution. If the density of the solution is
, calculate its molarity.               [2] 
]
2 4 2
[C H (OH)
-1
1.072gmL
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
OR 
 
       Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic 
acid to lower its melting point by 1.5
°
C. (Kf = 3.9 K kg mol
-1
) 
 
7. Calculate the equilibrium constant for the following reaction at 298 K.          [2] 
(s) 2(g) 2(aq)
Cu Cl CuCl ? ? ? ? (R = 8.314 J/K mol) 
02
0
12
2
1
E Cu / Cu 0.34V
E Cl / Cl 1.36V
1F 96500 Cmol
?
?
?
?
?
?
 
 
 
8. For a certain chemical reaction, variation in concentration ln [R] vs  time (s) plot is 
given below:                 [2]                       
  
 
(a) What are the units of the rate constant k? 
(b) What does the slope of the graph indicate?             
  
 
9. Give reason for the following:                                                         [2] 
(a) CN
-
 ion is known, but CP
-
 ion is not known. 
(b) NO2 dimerises to form N2O5. 
(c) ICl is more reactive than I2. 
  
 
10.  Account for the following:                                                                                                                 [2]                       
        (a) Nitration of aniline gives a substantial amount of m-nitroaniline. 
        (b) pKb of aniline is more than that of methylamine.          
 
OR 
 
        (a) Why do primary amines have higher boiling points than tertiary amines?                [2]                       
        (b) Identify A and B. 
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
 
11. Arrange the following compounds in increasing order of their reactivity in nucleophilic 
addition reactions.                                              [2] 
(a) Ethanal, Propanal, Propanone, Butanone 
(b) Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone. 
 
12.                                                                [2] 
(a) What are biodegradable polymers? Give an example.                                
(b) In which classes, the polymers are classified on the basis of molecular forces?                                                                                                                   
 
Section C 
13.                                                           [3] 
(a) What is the co-ordination number of each sphere in the bcc structure?   
(b) What is the formula of a crystalline compound in which atoms of A are present in all 
eight corners and atoms of B at the centre of all six faces? 
(c) Give an example of a compound of groups 12–16.                       
 
14. 2 g of  dissolved in 25 g of benzene shows a depression in freezing point 
equal to 1.62 K. Molal depression constant for benzene is 4.9 K kg mol
-1
. What is the 
percentage association of acetic acid if it forms a dimer solution?             [3] 
 
15. Dissociation of in the gas phase is a first-order reaction with rate constant 
 at 600 K. Calculate the percentage of  that would remain after 200 
min of reaction time.    
OR 
 
A reaction  is a single step reversible reaction. The energy of activation 
for the forward reaction is 38.9 kJ and that of the backward reaction is   
Draw the energy level diagram indicating . 
 
16. Explain the word with suitable examples:                            [3] 
(a) Alcosol 
(b) Aerosol 
(c) Hydrosol 
 
17.                                                                      [3] 
(a) Explain why pine oil is used in the froth flotation process. 
(b) Define collectors.                              
                               
OR 
65
C H COOH
22
SO Cl
-5 -1
2.3×10 s
22
SO Cl
A + B C + D
51.8kJ.
? ? ? ?
E f , E b & ?H
aa
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
Write the principle ores of each of the following metals: 
(a) Iron 
(b) Copper 
(c) Zinc  
 
18. Account for the following:                                    [3]  
(a) SO2 is a powerful reducing agent in alkaline medium than in acidic medium. 
(b) Compounds of fluorine and oxygen are called fluorides and not oxides. 
(c) H2S cannot be dried by passing over conc. H2SO4.         
              
19.                                                            [3] 
(a) Why does NH3 readily form complexes but NH4
+
 does not?      
(b) Write the following: 
(i) Ionisation isomer of [Co(NH3)5Br]SO4 
(ii) Linkage isomer of [Co(NH3)5ONO]Cl2                            
 
20. Write the structure of the major organic product in each of the following reactions:    [3]  
             
    
             (iii) 
                                         
  
OR 
 
What happen when  
(a) N-butyl chloride is treated with alcoholic KOH. 
(b) Bromobenzene is treated with Mg in the presence of dry ether. 
(c) Chlorobenzene is subjected to hydrolysis. 
 
 
21. Phenol is a weak acid. What substitution in the molecule can make it a stronger acid and 
a weaker acid? Give reasons.                                  [3] 
 
 
22. An aq. solution of gas ‘A’ gave the following reactions:            [3]   
(a) It decolourises acidified  solution. 
(b) On boiling with H2O2 followed by cooling and then adding an aq. solution of BaCl2, a 
white ppt. insoluble in dil. HCl was obtained. 
(c) On passing H2S gas through the solution of the gas, turbidity was obtained. 
Identify the gas and give equations involved in the above steps.   
? ?
ethanol
heat
3
3
6 5 2 2 5
(i) CH CBr KOH
H CH CI C H ONa (ii)C
? ? ? ? ? ? ? ?
??
4
KMnO
Page 5


  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
CBSE 
Class XII Chemistry 
Sample Paper 5 
 
Time: 3 Hrs                                                                              Total Marks: 70 
_________________________________________________________________________________________________________ 
General Instructions: 
? All questions are compulsory.  
? Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.  
? Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.  
? Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.  
? Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.  
? There is no overall choice. However, an internal choice has been provided in two 
questions of one mark, two questions of two marks, four questions of three marks and 
all the three questions of five marks weightage. You have to attempt only one of the 
choices in such questions.  
? Use log tables if necessary. Use of a calculator is not allowed.  
 
Section A 
1. Refractive index of a solid is observed to have the same value along all directions. 
Comment on the nature of this solid.              [1] 
OR 
       What are the coordination numbers of hcp and ccp? 
 
2. A finely divided substance is more effective as an absorbent. Why?          [1] 
 
3. Write any one use of pyrophoric alloys.                              [1] 
OR 
       Write the formula of the compound where the transition metal is in the +7 oxidation 
state. 
 
4. Give the IUPAC name of                [1]  
                                                                 
 
5. Write the monomer units of bakelite.               [1] 
 
Section B 
 
6. An antifreeze solution is prepared from 222.6 g of ethylene glycol  and 200 
g of water. Calculate the molality of the solution. If the density of the solution is
, calculate its molarity.               [2] 
]
2 4 2
[C H (OH)
-1
1.072gmL
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
OR 
 
       Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic 
acid to lower its melting point by 1.5
°
C. (Kf = 3.9 K kg mol
-1
) 
 
7. Calculate the equilibrium constant for the following reaction at 298 K.          [2] 
(s) 2(g) 2(aq)
Cu Cl CuCl ? ? ? ? (R = 8.314 J/K mol) 
02
0
12
2
1
E Cu / Cu 0.34V
E Cl / Cl 1.36V
1F 96500 Cmol
?
?
?
?
?
?
 
 
 
8. For a certain chemical reaction, variation in concentration ln [R] vs  time (s) plot is 
given below:                 [2]                       
  
 
(a) What are the units of the rate constant k? 
(b) What does the slope of the graph indicate?             
  
 
9. Give reason for the following:                                                         [2] 
(a) CN
-
 ion is known, but CP
-
 ion is not known. 
(b) NO2 dimerises to form N2O5. 
(c) ICl is more reactive than I2. 
  
 
10.  Account for the following:                                                                                                                 [2]                       
        (a) Nitration of aniline gives a substantial amount of m-nitroaniline. 
        (b) pKb of aniline is more than that of methylamine.          
 
OR 
 
        (a) Why do primary amines have higher boiling points than tertiary amines?                [2]                       
        (b) Identify A and B. 
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
 
11. Arrange the following compounds in increasing order of their reactivity in nucleophilic 
addition reactions.                                              [2] 
(a) Ethanal, Propanal, Propanone, Butanone 
(b) Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone. 
 
12.                                                                [2] 
(a) What are biodegradable polymers? Give an example.                                
(b) In which classes, the polymers are classified on the basis of molecular forces?                                                                                                                   
 
Section C 
13.                                                           [3] 
(a) What is the co-ordination number of each sphere in the bcc structure?   
(b) What is the formula of a crystalline compound in which atoms of A are present in all 
eight corners and atoms of B at the centre of all six faces? 
(c) Give an example of a compound of groups 12–16.                       
 
14. 2 g of  dissolved in 25 g of benzene shows a depression in freezing point 
equal to 1.62 K. Molal depression constant for benzene is 4.9 K kg mol
-1
. What is the 
percentage association of acetic acid if it forms a dimer solution?             [3] 
 
15. Dissociation of in the gas phase is a first-order reaction with rate constant 
 at 600 K. Calculate the percentage of  that would remain after 200 
min of reaction time.    
OR 
 
A reaction  is a single step reversible reaction. The energy of activation 
for the forward reaction is 38.9 kJ and that of the backward reaction is   
Draw the energy level diagram indicating . 
 
16. Explain the word with suitable examples:                            [3] 
(a) Alcosol 
(b) Aerosol 
(c) Hydrosol 
 
17.                                                                      [3] 
(a) Explain why pine oil is used in the froth flotation process. 
(b) Define collectors.                              
                               
OR 
65
C H COOH
22
SO Cl
-5 -1
2.3×10 s
22
SO Cl
A + B C + D
51.8kJ.
? ? ? ?
E f , E b & ?H
aa
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
Write the principle ores of each of the following metals: 
(a) Iron 
(b) Copper 
(c) Zinc  
 
18. Account for the following:                                    [3]  
(a) SO2 is a powerful reducing agent in alkaline medium than in acidic medium. 
(b) Compounds of fluorine and oxygen are called fluorides and not oxides. 
(c) H2S cannot be dried by passing over conc. H2SO4.         
              
19.                                                            [3] 
(a) Why does NH3 readily form complexes but NH4
+
 does not?      
(b) Write the following: 
(i) Ionisation isomer of [Co(NH3)5Br]SO4 
(ii) Linkage isomer of [Co(NH3)5ONO]Cl2                            
 
20. Write the structure of the major organic product in each of the following reactions:    [3]  
             
    
             (iii) 
                                         
  
OR 
 
What happen when  
(a) N-butyl chloride is treated with alcoholic KOH. 
(b) Bromobenzene is treated with Mg in the presence of dry ether. 
(c) Chlorobenzene is subjected to hydrolysis. 
 
 
21. Phenol is a weak acid. What substitution in the molecule can make it a stronger acid and 
a weaker acid? Give reasons.                                  [3] 
 
 
22. An aq. solution of gas ‘A’ gave the following reactions:            [3]   
(a) It decolourises acidified  solution. 
(b) On boiling with H2O2 followed by cooling and then adding an aq. solution of BaCl2, a 
white ppt. insoluble in dil. HCl was obtained. 
(c) On passing H2S gas through the solution of the gas, turbidity was obtained. 
Identify the gas and give equations involved in the above steps.   
? ?
ethanol
heat
3
3
6 5 2 2 5
(i) CH CBr KOH
H CH CI C H ONa (ii)C
? ? ? ? ? ? ? ?
??
4
KMnO
  
 
CBSE XII  |  Chemistry  
Sample Paper 5 
  
     
23.  
(a) Classify the following into monosaccharide and disaccharide:                        [3]                       
Sucrose, lactose, ribose, galactose 
(b) Which type of linkage is present in the primary structure of protein?                                                                              
(c) What happens when D-glucose is treated with ?
         
                        
Give only the involved equations.                                      
 
OR 
 
Name the main disease caused by lack of vitamin and its source in each of the following: 
A, B6 and E 
 
24.                                                          [3] 
(a) What problem arises in using alitame as an artificial sweetener?  
(b) If water contains dissolved calcium hydrogen carbonate, will you use a soap or a 
detergent for washing clothes and why?                                                                                   
 
Section D 
 
25.                                                  [5] 
(a) Predict the product of electrolysis on each of the following:  
(i) An aqueous solution of CuSO4 at copper electrodes 
(ii) An aqueous solution of CuCl2 with platinum electrodes 
 
(b) Three electrolytic cells A, B and C containing solutions of ZnSO4, AgNO3 and CuSO4 
are connected in series. A steady current of 1.5 amperes was passed through until 
1.45 g of silver deposited at the cathode of cell B. How long did the current flow? 
What mass of copper and of zinc were deposited? (Molar mass of Zn = 65.4, Ag = 
107.9, Cu = 63.5)                                     
OR 
 
(a) In the button cell, widely used in watches and other devices, the following reaction 
takes place: 
              
 
               Determine  and  for the reaction. Given  
               
                                 
 
(b)  Explain with examples the terms weak and strong electrolytes. How can these be 
distinguished?                    
                              
3
HI, ? a n d c o n c . H N O
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
2+ -
Zn s + Ag O s + H O l Zn aq + 2Ag s + 2OH aq
22
?
cell
E
o
r
G ?
??
+ 2+
Ag /Ag Zn /Zn
E =+0.80V, E =-0.76 V
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