Kerala Plus Two Question Paper 2023 Chemistry

SECOND YEAR

Kerala Board
Question Paper
2023

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Reg. No. : ......................................
Name : ...........................................
SY-525
SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH 2023

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. The unit of rate constant of a zero order chemical reaction is ________.

2. Among the following transition elements which one has a completely filled d orbital ?

(a) Ag (b) Ti

(c) Mo (d) Ni

3. Give an example for a didentate ligand.

Acetone
4. CH3 – CH2 – Br + NaI  CH3 – CH2 – I + NaBr

The name of this reaction is ________.

5. Identify the product ‘X’ in the chemical reaction given below :

O
|| H2
C – Cl  X
Pd/BaSO4

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

6. State Henry’s law. Write any one application of it.

7. What are Ideal Solutions ? Give one example.

SY-525 2

1  5    4  .
1  . (4  1 = 4)
1.        ________
.

2.     
 d   ?

(a) Ag (b) Ti
(c) Mo (d) Ni

3.    .

Acetone
4. CH3 – CH2 – Br + NaI  CH3 – CH2 – I + NaBr

   ________ .

5.      ‘X’  
 :

O
|| H2
C – Cl  X
Pd/BaSO4

6  15    8  .
2  . (8  2 = 16)

6.   .     .

7.    ?   .

SY-525 3 P.T.O.

8. ºm for NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol–1

respectively. Calculate ºm for CH3COOH.

9. (i) What are Pseudo first order reactions ? (1)

(ii) Write one example for pseudo first order reaction. (1)

10. (i) Transition elements show variable oxidation state. Why ? (1)

(ii) Identify the element in the 3d transition metal series that exhibits maximum
number of oxidation states. (1)

11. Write the IUPAC names of the following compounds :

(a) [Co(NH3)4(H2O)Br]Br2

(b) K3[Al(C2O4)3]

12. Differentiate between SN1 and SN2 reactions.

13. How is phenol manufactured industrially ? Write the chemical equation.

14. Aniline does not undergo Friedel craft’s reaction. Why ?

15. What are oligosaccharides ? Give any two examples.

SY-525 4

8. NaCl, HCl , CH3COONa  ºm  126.4, 425.9 and 91.0 S cm2 mol–1

. CH3COOH  ºm  .

9. (i)        ? (1)

(ii)        . (1)

10. (i)     .
 ? (1)

(ii) 3d      
  ? (1)

11.    IUPAC   :

(a) [Co(NH3)4(H2O)Br]Br2

(b) K3[Al(C2O4)3]

12. SN1  SN2    .

13.    ? 
   .

14.   
   .  ?

15.    ?   
.

SY-525 5 P.T.O.

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

16. (i) Define Molar Conductivity. (1)

(ii) Graphically represent the variation of molar conductivity with concentration for
strong and weak electrolytes. (2)

17. (i) A first order reaction is found to have a rate constant, k = 6.8  10–14 s–1. Find
the half life of the reaction. (1)

(ii) Write the integrated rate equation for a first order reaction and explain the terms
in it. (2)

18. Explain the effect of temperature and catalyst on the rate of chemical reaction.

19. Write the preparation of K2Cr2O7 from Chromite ore.

20. (i) What is Spectrochemical series ? (1)

(ii) Draw figure to show the splitting of d orbitals in octahedral crystal field and
label the diagram. (2)

21. Name the products formed when phenol is treated with the following reagents :

(i) Bromine water (1)

(ii) Zinc dust (1)

(iii) Conc. HNO3 (1)

22. Explain the following :

(i) Kolbe’s reaction (1½)

(ii) Reimer-Tiemann reaction (1½)

SY-525 6

16  26    8  .
3  . (8  3 = 24)
16. (i)   . (1)
(ii)    
 ,    
   . (2)

17. (i)       , k = 6.8  10–14
s–1 .   . (1)
(ii)      
 . (2)

18.      
 .

19.    K2Cr2O7   .

20. (i)     ? (1)
(ii)    d-  
. (2)

21.     
    :
(i)   (1)
(ii)   (1)
(iii)  HNO3 (1)

22.    :
(i)   (1½)
(ii) -  (1½)

SY-525 7 P.T.O.

23. (i) Write any two nucleophilic addition reactions of aldehyde. (2)

(ii) Name the product formed when ethanal is reduced with LiAlH4. (1)

24. (i) Which one is more reactive among aldehydes and ketones ? (1)

(ii) Describe any two tests to distinguish aldehydes from ketones. (2)

25. (i) What is Carbylamine reaction ? (1)

(ii) Explain why aniline is less basic than ammonia. (2)

26. (i) What are essential and non-essential amino acids ? (1)

(ii) Explain the amphoteric behaviour of amino acids. (2)

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

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

(ii) Write any two colligative properties. (1)

(iii) What is reverse osmosis ? Mention one important practical utility of reverse
osmosis. (2)

28. Lead storage battery which is commonly used in automobiles is an example for a
secondary cell.

(i) Write the name of anode and cathode used in this cell. (1)

(ii) Write the reactions taking place in the anode and cathode of this cell. (2)

(iii) Explain how this cell can be recharged. (1)

SY-525 8

23. (i)     
 . (2)
(ii) LiAlH4    
  . (1)

24. (i) ,    
 ? (1)
(ii)    
   . (2)

25. (i)      ? (1)
(ii)     
  ? (2)

26. (i)     
   ? (1)
(ii)     . (2)

27  31    4  .
4  . (4  4 = 16)
27. (i)     ? (1)
(ii)     . (1)
(iii)     ?  
     . (2)

28.       
  .
(i)      
. (1)
(ii)      
 . (2)
(iii)      . (1)
SY-525 9 P.T.O.

29. (i) Draw the structure of the geometrical isomers of the co-ordination compound
[Co(NH3)4Cl2]+. (2)

(ii) On the basis of Valence Bond Theory (VBT) explain the structure and magnetic
property of [Ni(CN)4]2–. (2)

30. (i) Identify the major and minor product obtained by the reaction between 2-bromo
butane and alcoholic KOH. (2)

(ii) Name and state the rule behind the formation of these products. (2)

31. (i) Explain Haloform reaction. (2)

(ii) How will you prepare benzaldehyde by Gatterman – Koch reaction ? (1)

(iii) Write the name of the reaction involved in the following conversion :

Zn – Hg
CH3 – CO – CH3  CH3 – CH2 – CH3 + H2O (1)
HCl

____________

SY-525 10

29. (i) [Co(NH3)4Cl2]+    
  . (2)

(ii)    (VBT)  [Ni(CN)4]2– 
    . (2)

30. (i) 2-   KOH  
     
 . (2)

(ii)      
  . (2)

31. (i)    . (2)

(ii) -   
 : (1)

(iii)      
.
Zn – Hg
CH3 – CO – CH3  CH3 – CH2 – CH3 + H2O (1)
HCl

____________

SY-525 11 P.T.O.

SY-525 12