GATE CY year:2019 PYQs & Answers — Page 6

Questions 51–60 of 65. Imported answers require independent review unless marked reviewed.

In the following reaction sequence, the products P and Q are

Your answerChoose one option.

Diagram for Chemistry question 41 (figure 2)

Diagram for Chemistry question 41 (figure 3)

Diagram for Chemistry question 41 (figure 4)

Diagram for Chemistry question 41 (figure 5)

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The major product formed in the following reaction is

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Diagram for Chemistry question 42 (figure 2)

Diagram for Chemistry question 42 (figure 3)

Diagram for Chemistry question 42 (figure 4)

Diagram for Chemistry question 42 (figure 5)

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The rate of the following redox reaction is slowest when X is

Your answerChoose one option.

H₂O

NH₃

Cl⁻

N₃⁻

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A complex is composed of one chromium ion, three bromides and six water molecules. Upon addition of excess AgNO₃, 1.0 g aqueous solution of the complex gave 0.94 g of AgBr. The molecular formula of the complex is

(Atomic weight: Cr = 52, Br = 80, Ag = 108, O = 16 and H = 1)

Your answerChoose one option.

[Cr(H₂O)₆]Br₃

[Cr(H₂O)₅Br]Br₂·H₂O

[Cr(H₂O)₄Br₂]Br·2H₂O

[Cr(H₂O)₃Br₃]·3H₂O

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The number of possible optically active isomer(s) for the following complex is ________.

[(en)₂Co(N₂)(H₂)Co(en)₂]⁴⁺

en = ethylenediamine

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The specific rotation of optically pure (R)-2-bromobutane is −112.00. A given sample of 2-bromobutane exhibited a specific rotation of −82.88. The percentage of (S)-(+)-enantiomer present in this sample is ________.

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Consider the following two parallel irreversible first order reactions at temperature T,

P → Q (k₁) P → R (k₂)

where k₁ and k₂ are the rate constants and their values are 5 × 10⁻² and 15 × 10⁻² min⁻¹, respectively, at temperature T. If the initial concentration of the reactant ‘P’ is 4 mol L⁻¹, then the concentration of product ‘R’ after 10 min of reaction is ______ mol L⁻¹. (Round off to two decimal places)

(Assume only P is present at the beginning of the reaction.)

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Consider the following equilibrium

At 298 K, the standard molar Gibbs energies of formation, ΔfG°, of SO₂(g) and SO₃(g) are −300 and −371 kJ mol⁻¹, respectively. The value of the equilibrium constant, Kₚ, at this temperature is ______ × 10¹⁰. (Round off to the nearest integer)

(Gas constant R = 8.31 J mol⁻¹ K⁻¹)

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Consider the electrochemical cell

M(s)|M₂(s)|M₂(aq)|M(s)

where ‘M’ is a metal. At 298 K, the standard reduction potentials are E°M²⁺(aq)/M(s) = −0.12 V, E°M₂(s)/M(s) = 0.36 V and the temperature coefficient is (∂E°cell/∂T)ₚ = 1.5 × 10⁻⁴ V K⁻¹. At this temperature the standard enthalpy change for the overall cell reaction, ΔrH°, is ______ kJ mol⁻¹. (Round off to two decimal places)

(Faraday constant F = 96500 C mol⁻¹)

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The normal boiling point of a compound (X) is 350 K (heat of vaporization, ΔvapH = 30 kJ mol⁻¹). The pressure required to boil ‘X’ at 300 K is ______ Torr. (Round off to two decimal places)

(Ignore the temperature variation of ΔvapH; Gas constant R = 8.31 J mol⁻¹ K⁻¹ and 1 atm = 760 Torr)

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GATE CY year:2019 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50