Q38. Functional group present in sulphonic acids is :
(1) $- \mathrm { SO } _ { 4 } \mathrm { H }$
(2) $- \mathrm { SO } _ { 3 } \mathrm { H }$
(3) $- \underset { \text { II } } { \mathrm { S } } - \mathrm { OH }$
(4) $- \mathrm { SO } _ { 2 }$

Q38. How can an electrochemical cell be converted into an electrolytic cell?
(1) Applying an external opposite potential lower than $\mathrm { E } ^ { 0 }$ cell.
(2) Reversing the flow of ions in salt bridge.
(3) Applying an external opposite potential greater than $\mathrm { E } ^ { 0 }$ cell-
(4) Exchanging the electrodes at anode and cathode.

Q38. Thiosulphate reacts differently with iodine and bromine in the reactions given below: $2 \mathrm {~S} _ { 2 } \mathrm { O } _ { 3 } ^ { 2 - } + \mathrm { I } _ { 2 } \rightarrow \mathrm {~S} _ { 4 } \mathrm { O } _ { 6 } ^ { 2 - } + 2 \mathrm { I } ^ { - }$ $\mathrm { S } _ { 2 } \mathrm { O } _ { 3 } ^ { 2 - } + 5 \mathrm { Br } _ { 2 } + 5 \mathrm { H } _ { 2 } \mathrm { O } \rightarrow 2 \mathrm { SO } _ { 4 } ^ { 2 - } + 4 \mathrm { Br } ^ { - } + 10 \mathrm { H } ^ { + }$ Which of the following statement justifies the above dual behaviour of thiosulphate?
(1) Bromine is a stronger oxidant than iodine
(2) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reaction
(3) Bromine is a weaker oxidant than iodine
(4) Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Q38. Given below are two statements : Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine. Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method. In the light of the above statements, choose the correct answer from the options given below
(1) Both Statement I and Statement II are true
(2) Both Statement I and Statement II are false
(3) Statement I is false but Statement II is true
(4) Statement I is true but Statement II is false

Q38. Relative stability of the contributing structures is : [Figure]
(1) (I) $>$ (II) $>$ (III)
(2) (I) $>$ (III) $>$ (II)
(3) (II) $>$ (I) $>$ (III)
(4) (III) $>$ (II) $>$ (I)

Q38. The correct stability order of the following resonance structures of $\mathrm { CH } _ { 3 } - \mathrm { CH } = \mathrm { CH } - \mathrm { CHO }$ is $\mathrm { CH } _ { 3 } - \stackrel { \ominus } { \mathrm { CH } } - \mathrm { CH } = \stackrel { \mathrm { O } } { \mathrm { C } } - \mathrm { H } \leftrightarrow$ I $\mathrm { CH } _ { 3 } - \stackrel { \oplus } { \mathrm { CH } } - \mathrm { CH } = \mathrm { O } : \Theta - \mathrm { C } - \mathrm { H } \leftrightarrow$ II [Figure] III
(1) I $>$ II $>$ III
(2) II $>$ III $>$ I
(3) II $>$ I $>$ III
(4) III $>$ II $>$ I
Q39. [Figure]
Total number of stereo isomers possible for the given structure :
(1) 2
(2) 4
(3) 3
(4) 8

Q39. The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is : (Given : Molar Mass $\mathrm { Na } : 23$ and $\mathrm { Cl } : 35.5 \mathrm { gmol } ^ { - 1 }$ )
(1) 2
(2) 20
(3) 4
(4) 0.2

Q39. The adsorbent used in adsorption chromatography is/are - A. silica gel B. alumina C. quick lime D. magnesia Choose the most appropriate answer from the options given below :
(1) A only
(2) B only
(3) C and D only
(4) A and B only
Q40. [Figure]
Product P is
(1) [Figure]
(2) [Figure]
(3) [Figure]
(4) [Figure]
Q41. [Figure]
In the above chemical reaction sequence " A " and " B " respectively are
(1) $\mathrm { H } _ { 2 } \mathrm { O } , \mathrm { H } ^ { + }$and $\mathrm { KMnO } _ { 4 }$
(2) $\mathrm { O } _ { 3 } , \mathrm { Zn } / \mathrm { H } _ { 2 } \mathrm { O }$ and $\mathrm { NaOH } _ { ( \text {alc } ) } / \mathrm { I } _ { 2 }$
(3) $\mathrm { O } _ { 3 } , \mathrm { Zn } / \mathrm { H } _ { 2 } \mathrm { O }$ and $\mathrm { KMnO } _ { 4 }$
(4) $\mathrm { H } _ { 2 } \mathrm { O } , \mathrm { H } ^ { + }$and $\mathrm { NaOH } _ { ( \text {alc } ) } / \mathrm { I } _ { 2 }$

Q39. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cis form of alkene is found to be more polar than the trans form. Reason (R): Dipole moment of trans isomer of 2-butene is zero. In the light of the above statements, choose the correct answer from the options given below :
(1) (A) is false but (R) is true
(2) Both (A) and (R) are true and (R) is the correct explanation of (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

Q39. Identify $A$ and $B$ in the given chemical reaction sequence : [Figure]
(1) [Figure]
B - [Figure]
(2) [Figure]
(3) [Figure] [Figure]
(4) [Figure] , B- [Figure]

Q39. Which of the following statements are correct? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. Aniline can be purified by steam distillation as aniline is miscible in water. C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope. D. An organic compound is pure, if mixed M.P. is remained same. Choose the most appropriate answer from the options given below :
(1) A, B, C only
(2) A, C, D only
(3) A, B, D only
(4) B, C, D only
Q40. [Figure]
(X)
Which of the following is metamer of the given compound $( \mathrm { X } )$ ?
(1) [Figure]
(2) [Figure]
(3) [Figure]
(4) [Figure]

Q39. Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D) Ti (E) Mn Choose the correct answer from the options given below :
(1) (A) $<$ (D) $<$ (C) $<$ (B) $<$ (E)
(2) (C) $<$ (E) $<$ (B) $<$ (A) $<$ (D)
(3) (A) $<$ (D) $<$ (C) $<$ (E) $<$ (B)
(4) (B) $<$ (C) $<$ (D) $<$ (E) $<$ (A)

Q39. Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The stability order of + 1 oxidation state of Ga , In and T 1 is $\mathrm { Ga } < \mathrm { In } < \mathrm { T } 1$. Reason R : The inert pair effect stabilizes the lower oxidation state down the group. In the light of the above statements, choose the correct answer from the options given below:
(1) A is true but R is false.
(2) A is false but R is true.
(3) Both A and R are true and R is the correct explanation of A .
(4) Both A and R are true but R is NOT the correct explanation of A .
Q40.
A. [Figure]
B. [Figure]
C. [Figure]
Which of the following are aromatic?
D. [Figure]
(1) A and C only
(2) B and D only
(3) C and D only
(4) A and B only
Q41. [Figure]
Given below are two statements: Statements I:
Compound A [Figure]
IUPAC name of Compound $A$ is 4-chloro-1,3-dinitrobenzene. Statements II:
Compound B
IUPAC name of Compound B is 4-ethyl-2-methylaniline. In the light of the above statements, choose the most appropriate answer from the options given below:
(1) Both Statement I and Statement II are incorrect.
(2) Both Statement I and Statement II are correct.
(3) Statement I is correct but Statement II is incorrect.
(4) Statement I is incorrect but Statement II is correct.

Q39. In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :
(1) $\mathrm { Na } _ { 3 } \mathrm { PO } _ { 4 } \cdot 12 \mathrm { MoO } _ { 3 }$
(2) $\left( \mathrm { NH } _ { 4 } \right) _ { 3 } \mathrm { PO } _ { 4 } \cdot 12 \mathrm { MoO } _ { 3 }$
(3) $\mathrm { MoPO } _ { 4 } \cdot 21 \mathrm { NH } _ { 4 } \mathrm { NO } _ { 3 }$
(4) $\left( \mathrm { NH } _ { 4 } \right) _ { 3 } \mathrm { PO } _ { 4 } \cdot 12 \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { MoO } _ { 4 }$

Q39. Identify the product A and product B in the following set of reactions. [Figure]
(1) [Figure]
B - [Figure]
(2) $\mathrm { A } - \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 } \quad \mathrm {~B} - \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 }$
(3) $\mathrm { A } - \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } - \mathrm { OH } \quad \mathrm { B } - \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } - \mathrm { OH }$
(4) [Figure]
$$\text { B - } \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } - \mathrm { OH }$$

Q40. What pressure (bar) of $\mathrm { H } _ { 2 }$ would be required to make emf of hydrogen electrode zero in pure water at $25 ^ { \circ } \mathrm { C }$ ?
(1) $10 ^ { - 7 }$
(2) 0.5
(3) 1
(4) $10 ^ { - 14 }$

40. (3) 48. (3) 56. (50) 64. (4) 72. (1) 80. (2) 88. (31)

Q40. For the Compounds : (A) $\mathrm { H } _ { 3 } \mathrm { C } - \mathrm { CH } _ { 2 } - \mathrm { O } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 3 }$ (B) $\mathrm { H } _ { 3 } \mathrm { C } - \mathrm { CH } _ { 2 } ^ { 2 } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 2 } - \mathrm { CH } _ { 3 }$ (C) [Figure]
The increasing order of boiling point is : Choose the correct answer from the options given below :
(1)
(D) $< ($ C $) < ($ A $) < ($ B )
(2) $( \mathrm { B } ) < ( \mathrm { A } ) < ( \mathrm { C } ) < ( \mathrm { D } )$
(3) $( \mathrm { A } ) <$
(B) <
(C) < (D)
(4) (B) $<$ (A) $<$ (D) $<$ (C)

Q40.
Consider the given chemical reaction : [Figure]
Product " A " is :
(1) picric acid
(2) acetic acid
(3) adipic acid
(4) oxalic acid

Q40. The correct IUPAC name of $\left[ \mathrm { PtBr } _ { 2 } \left( \mathrm { PMe } _ { 3 } \right) _ { 2 } \right]$ is :
(1) dibromodi(trimethylphosphine)platinum(II)
(2) bis(trimethylphosphine)dibromoplatinum(II)
(3) dibromobis(trimethylphosphine)platinum(II) [0pt] (4) bis[bromo(trimethylphosphine)]platinum(II)

Q40. The emf of cell $\mathrm { Tl } \left| \underset { ( 0.001 \mathrm { M } ) } { \mathrm { Tl } ^ { + } } \right| \left| \underset { ( 0.01 \mathrm { M } ) } { \mathrm { Cu } ^ { 2 + } } \right| \mathrm { Cu }$ is 0.83 V at 298 K . It could be increased by :
(1) decreasing concentration of both $\mathrm { Tl } ^ { + }$and $\mathrm { Cu } ^ { 2 + }$
(2) increasing concentration of $\mathrm { Cu } ^ { 2 + }$ ions ions
(3) increasing concentration of $\mathrm { T } 1 ^ { + }$ions
(4) increasing concentration of both $\mathrm { Tl } ^ { + }$and $\mathrm { Cu } ^ { 2 + }$ ions

Q40. The molar conductivity for electrolytes $A$ and $B$ are plotted against $C ^ { 1 / 2 }$ as shown below. Electrolytes $A$ and [Figure] $B$ respectively are :
(1) A: strong electrolyte ; B: weak electrolyte
(2) A: weak electrolyte ; B: weak electrolyte
(3) A: weak electrolyte ; B: strong electrolyte
(4) A: strong electrolyte ; B: strong electrolyte

Q40. Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning :
(1) $\Lambda _ { \mathrm { m } } - \Lambda _ { \mathrm { m } } ^ { 0 } + \mathrm { AC } ^ { \frac { 1 } { 2 } } = 0$
(2) $\Lambda _ { m } ^ { 2 } \mathrm { C } - \mathrm { K } _ { \mathrm { a } } \Lambda _ { \mathrm { m } } ^ { \circ 2 } + \mathrm { K } _ { \mathrm { a } } \Lambda _ { \mathrm { m } } \Lambda _ { \mathrm { m } } = 0$
(3) $\Lambda ^ { 2 } { } _ { m } \mathrm { C } + \mathrm { K } _ { \mathrm { a } } \Lambda _ { \mathrm { m } } ^ { \circ 2 } - \mathrm { K } _ { \mathrm { a } } \Lambda _ { \mathrm { m } } \Lambda _ { \mathrm { m } } ^ { \circ } = 0$
(4) $\Lambda _ { \mathrm { m } } - \Lambda _ { \mathrm { m } } ^ { \circ } - \mathrm { AC } ^ { \frac { 1 } { 2 } } = 0$

Q41. One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
(1) Oxidation - Reduction electrodes
(2) Metal ion - Metal electrodes
(3) Gas - Ion electrodes
(4) Metal - Insoluble Salt - Anion electrodes

41. (2) & 42. (2) & 43. (2) \hline 49. (3) & 50. (1) & $51 . ( 4 )$ \hline 57. (0) & 58. (8) & 59. (95) \hline 65. (1) & 66. (4) & 67. (2) \hline 73. (2) & 74. (1) & 75. (4) \hline 81. (5626) & 82. (4) & 83. (14) \hline 89. (6) & 90. (8288) & \hline \end{tabular}

1. (4)
2. (2)
3. (3)
4. (0)
5. (4)
6. (4)
7. (5)
8. (11)
9. (1)
10. (4)
11. (5)
12. (1)
13. (1)
14. (40)
15. (2)
16. (3)
17. (3)
18. (200)
19. (4)
20. (2)
21. (1)
22. (1024)
23. (2)
24. (1)
25. (3)
26. (208)
27. (1)
28. (3)
29. (18)

62 . (4) 70. (4) 78. (1) 86. (5) 7. (1) 15. (3) 23. (177) 31. (3) 39. (4) 47. (3) 55. (31) 63. (3) 71. (3) 79. (3) 87. (1) 8. (3) 16. (3) 24. (10) 32. (3)