Kerala Plus Two Question Paper 2024 Chemistry

Kerala Board

Question Paper
2024

Reg. No. : ......................................
SY-525 Name : ...........................................

SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH – 2024

Part – III Time : 2 Hours
CHEMISTRY Cool-off time : 15 Minutes
Maximum : 60 Scores

General Instructions to Candidates :
 There is a ‘Cool-off time’ of 15 minutes in addition to the writing time.
 Use the ‘Cool-off time’ to get familiar with questions and to plan your answers.
 Read questions carefully before answering.
 Read the instructions carefully.
 Calculations, figures and graphs should be shown in the answer sheet itself.
 Malayalam version of the questions is also provided.
 Give equations wherever necessary.
 Electronic devices except non-programmable calculators are not allowed in the
Examination Hall.

  :
    15  ‘  ’ .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

SY-525 1 P.T.O.

Answer any 4 questions from 1 to 5. Each carries 1 score. (4  1 = 4)

1. An electrochemical cell can behave like an electrolytic cell when ________.

(a) Ecell = 0 (b) Ecell > Eext

(c) Eext > Ecell (d) Ecell = Eext

2. Which of the following is the unit of rate constant for a first order reaction ?

(a) L mol–1 s–1 (b) s–1

(c) L–1 mol s–1 (d) L2 mol–2 s–1

3. Coordination number of copper in [Cu(CN)4]3– is _________.

4. Write the name of the poisonous gas formed when chloroform is oxidised by air in the
presence of light.

5. Name the linkage between two monosaccharide units in a disaccharide.

Answer any 8 questions from 6 to 15. Each carries 2 scores. (8  2 = 16)

6. Write any two applications of Henry’s law.

7. Calculate the standard emf of the cell in which the following reaction takes place :

Zn(s) + Cu2+(aq)  Zn2+(aq) + Cu(s)

(E Cu2+/Cu = 0.34 V & E Zn2+/Zn= – 0.76 V)

8. Write any two differences between order and molecularity.

SY-525 2

1  5    4  .
1  . (4  1 = 4)
1.       
  ________.
(a) Ecell = 0 (b) Ecell > Eext
(c) Eext > Ecell (d) Ecell = Eext

2.      
   ?
(a) L mol–1 s–1 (b) s–1
(c) L–1 mol s–1 (d) L2 mol–2 s–1

3. [Cu(CN)4]3–    _________.

4.     
   .

5.     
  .

6  15    8  .
2  . (8  2 = 16)
6.      .

7.       emf
.
Zn(s) + Cu2+ (aq)  Zn2+ (aq) + Cu(s)
(E° Cu2+/Cu = 0.34 V & E° Zn2+/Zn= – 0.76 V)

8. ,      
.

SY-525 3 P.T.O.

9. What is the effect of temperature on the rate constant of a reaction ? Write the
equation used to determine the effect of temperature on rate constant.

10. Identify the products X and Y formed in the following reactions :

(i) CH3CH2OH + PCl5  X + POCl3 + HCl (1)

(ii) CH3–Br + AgF  Y + AgBr (1)

11. The reaction between tert-butylbromide and hydroxide ion yields tert-butyl alcohol
follows SN1 mechanism. Write the mechanism.

12. Write the name and statement of the law that helps to identify the major product in the
-elimination reactions of haloalkanes.

13. Give reason for the solubility of alcohols in water.

14. (i) What is Tollens’ reagent ? (1)

(ii) Which among CH3CHO and CH3COCH3 form a silver mirror on reaction with

Tollens’ reagent ? (1)

15. Among CH3NH2 and C6H5NH2, which is more basic ? Give reason.

Answer any 8 questions from 16 to 26. Each carries 3 scores. (8  3 = 24)

16. Define ideal solutions by citing a suitable example. What are the values of mixH and

mixV for such a solution ?

SY-525 4

9.      
 ?     
 .

10.      X,
Y  .

(i) CH3CH2OH + PCl5  X + POCl3 + HCl (1)

(ii) CH3 – Br + AgF  Y + AgBr (1)

11. -   
 -   SN1 
.    .

12.  -  
     
.

13.     .

14. (i)    ? (1)
(ii) CH3CHO, CH3COCH3    
    ? (1)

15. CH3NH2, C6H5NH2, ,    ?
 .

16  26    8 
. 3  . (8  3 = 24)
16.     .
  mixH,mixV    ?

SY-525 5 P.T.O.

17. (i) Define molar conductivity of a solution. How does it vary with concentration ? (2)

(ii) State the law that helps to determine limiting molar conductivity of electrolytes. (1)

18. (i) What is meant by half-life of a reaction ? (1)

(ii) A first order reaction is found to have a rate constant, k = 5.5  10–14 s–1. Find

the half-life of the reaction. (2)

19. (i) Some transition metal ions are given in the box below. Choose the ions which
are coloured :

(Z for Sc, Ti and Cr are 21, 22 and 24 respectively) (2)

Sc3+, Ti4+, Ti3+, Cr3+

(ii) Give reason for the formation of coloured ions by transition metals. (1)

20. What is lanthanoid contraction ? What are the consequences of lanthanoid contraction ?

21. Draw the hybridisation scheme of [Co(NH3)6]3+ based on Valence Bond Theory.

Predict the geometry and magnetic behaviour of the complex.

22. (i) Write the formulae of the following coordination compounds :
(a) Pentaamminechloridocobalt(III)chloride (1)

(b) Potassiumhexacyanidoferrate(III) (1)

(ii) Which of the above is a heteroleptic complex ? (1)

SY-525 6

17. (i)     .  
  ? (2)

(ii)    
  . (1)

18. (i)     ? (1)

(ii)      , k = 5.5  10–14 s–1
.   . (2)

19. (i)      
.    ?
(Sc, Ti, Cr  Z  21, 22, 24 ) (2)

Sc3+, Ti4+, Ti3+, Cr3+

(ii)     
 . (1)

20.     ?  
  ?

21.     [Co(NH3)6]3+ 
   . 
   .

22. (i)     

(a) (III) (1)
(b) (III) (1)
(ii)      ? (1)

SY-525 7 P.T.O.

23. (i) Identify the products P & Q in the following reaction : (2)
OH

Dilute HNO3
 P+Q

(ii) What is the product obtained when phenol is treated with concentrated nitric

acid ? (1)

24. (i) An organic compound A on reaction with CrO2Cl2 in CS2 followed by

acidification gives benzaldehyde as a product. Identify the compound A and

also name the reaction. (2)

(ii) What is the product obtained when the above organic compound A undergoes

side chain oxidation with acidic potassium permanganate ? (1)

25. Describe Hinsberg test to distinguish primary, secondary and tertiary amines.

26. Write the classification of proteins on the basis of their molecular shape by giving

suitable examples.

Answer any 4 questions from 27 to 31. Each carries 4 scores. (4  4 = 16)

27. (i) What are colligative properties ? (1)

(ii) The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute

is dissolved in 90 g of benzene, the boiling point is raised to 354.11 K.

Calculate the molar mass of the solute. Kb for benzene is 2.53 K kg mol–1. (3)

SY-525 8

23. (i)    P, Q  
 : (2)

OH

Dilute HNO3
 P+Q

(ii)      
   ? (1)

24. (i) A     CS2-  CrO2Cl2 
    
 . A   ,
  . (2)

(ii)     A  
     
   ? (1)

25. , ,    
 .

26.     
   .

27  31    4 
. 4  . (4  4 = 16)

27. (i)     ? (1)

(ii)   353.23 K . 1.80 g  , 90 g
 ,  354.11 K  .
   .  Kb = 2.53 K kg mol–1. (3)

SY-525 9 P.T.O.

28. (i) Sketch the diagram of a H2–O2 fuel cell. (1)

(ii) Write the chemical equations for electrode reactions in it. (2)

(iii) Write any two advantages of a fuel cell. (1)

29. Explain the different types of structural isomerism in coordination compounds with
the help of suitable examples.

30. (i) Describe the manufacture of ethanol from molasses. (2)

(ii) What is meant by denaturation of alcohol ? (1)

(iii) Identify the product obtained when ethanol is treated with Conc. H2SO4 at 443 K. (1)

31. Describe the following reactions :

(i) Cannizaro reaction (2)

(ii) Stephen reaction (2)

_______________

SY-525 10

28. (i)  H2 – O2    . (1)

(ii)      
. (2)

(iii)      . (1)

29.     
   .

30. (i)     . (2)

(ii)    ? (1)

(iii) 443 K- .H2SO4   
 . (1)

31.    .
(i)   (2)

(ii)   (2)

_______________

SY-525 11 P.T.O.

SY-525 12

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