GATE CY format:nat PYQs & Answers — Page 9

Questions 81–90 of 166. Imported answers require independent review unless marked reviewed.

Topic practice 166 questionsPage 9 of 17

The rate constants for the decomposition of a molecule in the presence of oxygen are 0.237 × 10⁻⁴ L mol⁻¹ s⁻¹ at 0 °C and 2.64 × 10⁻⁴ L mol⁻¹ s⁻¹ at 25 °C (

J mol⁻¹ K⁻¹).

The activation energy for this reaction (rounded off to one decimal place) is ____________ kJ mol⁻¹.

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2 L of a gas at 1 atm pressure is reversibly heated to reach a final volume of 3.5 L. The absolute value of the work done on the gas (rounded off to the nearest integer) is ______ Joules.

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The quantity of the cobalt ore [Co₃(AsO₄)₂·H₂O] required to obtain 1 kg of cobalt (rounded off to two decimal places) is __________ kg.

[Atomic Wt. of Co = 59, As = 75, O = 16, H = 1]

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In the following reaction,

the number of peaks exhibited by the major product P in its broadband proton decoupled ¹³C NMR spectrum is ______

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Among the following,

the total number of aromatic species is ______

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The maximum number of microstates for

electronic configuration is ______

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In a uranium recovery process, an aqueous solution of uranyl ion is evaporated, dried in air at 400 °C and subsequently reduced with hydrogen at 700 °C to obtain a uranium compound (X). The oxidation state of uranium in X is ______

(Given: atomic number of U is 92)

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For a cubic crystal system, the powder X-ray diffraction pattern recorded using Cu K

source (

= 1.54 Å) shows a peak at 33.60° (

) for (111) plane. The lattice parameter ‘a’ (in Å, rounded off to two decimal places) is ______

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In an NMR spectrometer operating at a magnetic field strength of 16.45 T, the resonance frequency (in MHz, rounded off to one decimal place) of

F nucleus is ______

(Given: g factor of

F = 5.255;

= 5.05 × 10

J T

; h = 6.626 × 10

J s)

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When three moles of helium is mixed with one mole of neon at constant temperature and pressure (25 °C, 1 atm), the entropy of mixing (in J K

, rounded off to two decimal places) is ______

(Given: R = 8.314 J K

mol

)

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GATE CY format:nat PYQs

Question 53

Question 54

Question 55

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22