PART- II (CHEMISTRY)
SECTION – I
Straight Objective Type
This section contains 9 multiple choice questions numbere. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.
1. The species having bond order different from that in CO is
(A) NO−
(B) NO+
(C) CN−
(D) N2
2. Among the following, the paramagnetic compound is
(A) Na2O2
(B) O3
(C) N2O
(D) KO2
3. Extraction of zinc from zinc blende is achieved by
(A) electrolytic reduction
(B) roasting followed by reduction with carbon
(C) roasting followed by reduction with another metal
(D) roasting followed by self-reduction
4. In the following reaction,
the structure of the major product ‘X’ is
(A) 
(B) 
(C) 
(D) 
5. The reagent(s) for the following conversion,
is/are
(A) alcoholic KOH
(B) alcoholic KOH followed by NaNH2
(C) aqueous KOH followed by NaNH2
(D) Zn/CH3OH
6. The number of structural isomers for C6H14 is
(A) 3
(B) 4
(C) 5
(D) 6
7. The percentage of p-character in the orbitals forming P−P bonds in P4 is
(A) 25
(B) 33
(C) 50
(D) 75
8. When 20 g of naphthoic acid (C11H8O2) is dissolved in 50 g of benzene (Kf = 1.72 K kg mol−1), a freezing point depression of 2 K is observed. The van’t Hoff factor (i) is
(A) 0.5
(B) 1
(C) 2
(D) 3
9. The value of log10K for a reaction A ⇋ B is
(Given : ∆rH°298K 54.07kJ mol−1 , ∆rS°298K = 10JK−1 mol−1 and R = 8.314 JK−1 mol−1; 2.303 × 8.314 × 298 = 5705)
(A) 5
(B) 10
(C) 95
(D) 100
SECTION – II
Assertion-Reason Type
This section contains 4 questions number. Each question contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
10. STATEMENT-1: Boron always forms covalent bond.
because
STATEMENT-2: The small size of B3+ favours formation of covalent bond.
(A) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
(C) Statement-1 is True, Statement-2 is True.
(D) Statement-1 is False, Statement-2 is True.
11. STATEMENT-1: In water, orthoboric acid behaves as a weak monobasic acid.
because
STATEMENT-2: In water, orthoboric acid acts as a proton donor.
(A) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
(C) Statement-1 is True, Statement-2 is True.
(D) Statement-1 is False, Statement-2 is True.
12. STATEMENT-1: p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid.
because
STATEMENT-2: o-Hydroxybenzoic acid has intramolecular hydrogen bonding.
(A) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
(C) Statement-1 is True, Statement-2 is True.
(D) Statement-1 is False, Statement-2 is True.
13. STATEMENT-1: Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).
because
STATEMENT-2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
(A) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
(C) Statement-1 is True, Statement-2 is True.
(D) Statement-1 is False, Statement-2 is True.
SECTION – III
Linked Comprehension Type
This section contains 2 paragraphs. Based upon each paragraph, 3 multiple choice questions have to be answered. Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.
Paragraph for question Nos 14 to 16
The noble gases have closed-shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other interatomic interactions.
The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers +2, +4 and +6. XeF4 reacts violently with water to give XeO3. The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.
14. Argon is used in arc welding because of its
(A) low reactivity with metal
(B) ability to lower the melting point of metal
(C) flammability
(D) high calorific value
15. The structure of XeO3 is
(A) linear
(B) planar
(C) pyramidal
(D) T-shaped
16. XeF4 and XeF6 are expected to be
(A) oxidizing
(B) reducing
(C) unreactive
(D) strongly basic
Paragraph for Question Nos. 17 to 19
Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 × 1023) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept.
A 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass: Na = 23, Hg = 200; 1 Faraday=96500 coulombs)
17. The total number of moles of chlorine gas evolved is
(A) 0.5
(B) 1.0
(C) 2.0
(D) 3.0
18. If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is
(A) 200
(B) 225
(C) 400
(D) 446
19. The total charge (coulombs) required for complete electrolysis is
(A) 24125
(B) 48250
(C) 96500
(D) 193000
SECTION – IV
Matrix-Match Type
This section contains 3 questions. Each question contains statements given in two columns which have to be matched. Statements
(A, B, C, D) in Column-I have to be matched with statements (p, q, r, s) in Column-II.
20. Match the complexes in Column-I with their properties listed in Column-II.
(A) A → p, q, s B → p, r, s C → q, s D → q, s
(B) A → r, p, q B → s, q, p C → r, p D → p, r
(C) A → q, p, r B → s, p, q C → p, r D → s, p
(D) A → r, q, p B → s, q, r C → s, p D → p, r
21. Match the chemical substances in Column-I with type of polymers/type of bonds in Column-II.
(A) A → s, r B → q C → s, p D → r, p
(B) A → q, p B → s, p, q C → p, r D → s, p
(C) A → p, s, B → q, r; C → p, r D → s
(D) A → p, s B → r C → p, q D → p, s
22. Match gases under specified conditions listed in Column-I with their properties/laws in Column-II.
(A) A → s, r B → q C → s, p D → r, p
(B) A → q, p B → s, p, q C → p, r D → s, p
(C) A → q, p, r B → s, p, q C → p, r D → s, p
(D) A → p, s B → r C → p, q D → p, s
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