Download GATE 2015 XL H Life Sciences Question Paper

FirstRanker.com

Firstranker's choice

CHEMISTRY (COMPULSORY)

--- Content provided by​ FirstRanker.com ---

Q. 1 – Q. 5 carry one mark each.

Q.1

The molecule having net 'non-zero dipole moment' is

(A) CCl₄        (B) NF₃           (C) CO₂           (D) BCl₃

Q.2

--- Content provided by⁠ FirstRanker.com ---

The Diels-Alder adduct from the reaction between cyclopentadiene and benzyne is

(A)                 (B)                  (C)                  (D)

Q.3 The number of possible enantiomeric pair(s) in HOOC-CH(OH)-CH(OH)-COOH is_

Q.4

For the electrochemical reaction, Cu²⁺(aq) + Zn(s) = Cu(s) + Zn²⁺(aq)

--- Content provided by‍ FirstRanker.com ---

the equilibrium constant at 25 °C is 1.7 × 10³⁷. The change in standard Gibbs free energy (?G°) for this reaction at that temperature will be

(Given: R = 8.314 JK^-1mol^-1) __________ kJ mol^-1 (up to one decimal place).

Q.5 Among the following diagrams, the one that correctly describes a zero order reaction (X? product) is

(Given: [X]₀ = initial concentration of reactant X; [X] = concentration of reactant X at time t and t_1/2 = half-life period of reactant

(A)                  (B)

--- Content provided by‌ FirstRanker.com ---

(C)                  (D)

FirstRanker.com

Firstranker's choice

Q. 6 – Q. 15 carry two marks each.

Q.6

--- Content provided by‌ FirstRanker.com ---

If the radius of first Bohr orbit is 0.53 Å, then the radius of the third Bohr orbit is

(A) 2.12 Å        (B) 4.77 Å           (C) 1.59 Å           (D) 3.18 Å

Q.7

If 50 mL of 0.02 M HCl is added to 950 mL of H₂O, then the pH of the final solution will be __________.

Q.8

--- Content provided by​ FirstRanker.com ---

Stability of [CrCl₆]^3- (X), [MnCl₆]^3- (Y) and [FeCl₆]^3- (Z) follows the order

(Given: Atomic numbers of Cr = 24, Mn = 25 and Fe = 26)

(A) X > Y > Z        (B) X < Y < Z           (C) Y < X < Z           (D) X < Y = Z

Q.9 Among the following pairs, the paramagnetic and diamagnetic species, respectively, are

(A) CO and O₂        (B) NO and CO           (C) O₂^2- and CO           (D) NO⁺ and O₂

--- Content provided by​ FirstRanker.com ---

Q.10 In compounds K₄[Fe(CN)₆] (P) and Fe(CO)₅ (Q), the iron metal centre is bonded to

(A) C of CN^- in P and C of CO in Q        (B) N of CN^- in P and C of CO in Q

(C) C of CN^- in P and O of CO in Q        (D) N of CN^- in P and O of CO in Q

Q.11 Among the following reactions, the one that produces achiral alcohol (after hydrolysis) is

(A)                  (B)

--- Content provided by FirstRanker.com ---

(C)                  (D)

FirstRanker.com

Firstranker's choice

Q.12 The major product from the following reaction is

R = tert-Butyl

--- Content provided by FirstRanker.com ---

(A)                  (B)                  (C)                  (D)

Q.13 The order of resonance energy for the following molecules is

(1)                  (2)                  (3)                  (4)

(A) (1) > (3) > (2) > (4)        (B) (1) > (3) > (4) > (2)

(C) (1) > (4) > (2) > (3)        (D) (1) > (4) > (3) > (2)

--- Content provided by​ FirstRanker.com ---

Q.14 The molar enthalpy of vaporization for a liquid (normal boiling point = 78.3 °C) is 39 kJ mol^-1. If the liquid has to boil at 25 °C, the pressure must be reduced to __________ Torr (up to one decimal place).

(Given: R = 8.314 JK^-1mol^-1; 1 atm = 760 Torr)

Q.15

For the process, H₂O(l) ? H₂O(s) at 0 °C and 1 atm, the correct statement is

(A) ?S_system = 0        (B) ?S_total > 0           (C) ?S_total = 0           (D) ?S_total < 0

--- Content provided by⁠ FirstRanker.com ---

END OF THE QUESTION PAPER