GATE XL format:nat PYQs & Answers — Page 14

Questions 131–140 of 244. Imported answers require independent review unless marked reviewed.

Topic practice 244 questionsPage 14 of 25

Dry air is fed into a tray dryer. The percentage relative humidity of the air leaving the dryer is 60% at 70°C and 101.35 kPa. If saturated vapour pressure of water at 70°C is 31.2 kPa, the humidity of the air leaving the dryer in kg water per kg dry air (round off to 2 decimal places) will be _____. (Given : Molecular weight of water and air are 18.02 g mol⁻¹ and 28.97 g mol⁻¹ respectively)

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In naphthalene, the value of the integer “n” according to Hückel’s rule of aromaticity is _____.

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The azimuthal quantum number (

) of an electron in the

orbital of a copper atom (atomic number: 29) is _____.

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The standard enthalpy of reaction (in kJ mol

) for obtaining three moles of H

(g) from atomic hydrogen in gas phase is _____. (Given: Standard enthalpy of formation of atomic hydrogen in gas phase is 218 kJ mol

)

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A molecule in solution crystallizes into two different crystal forms with rate constants of 0.02 s

and 0.13 s

. If the crystallization is assumed to be under kinetic control, then the half-life (in seconds, rounded off to one decimal place) of the molecule is _________.

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The standard potential (

) for a cell reaction given below is +0.7 V. The standard reaction free energy (

) for this cell is ______ kJ mol

(correct up to two decimal places). (Given: Faraday constant, F = 96500 C mol

)

(aq) + 3 Ag (s)

Au (s) + 3 Ag

(aq)

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The activation energy (

) estimated for a reaction from the Arrhenius equation is 21 kJ mol

. If the frequency factor is assumed to be independent of temperature, then the ratio of the rate constants determined at 298 K and 260 K is ________ (rounded off to two decimal places). (Given: Gas constant, R = 8.315 J K

mol

)

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At a given pressure, a substance is heated from 2000 K to 2600 K. If the entropy of the substance is 60 J K

mol

, and is assumed to be constant over the given temperature range, then the change in the chemical potential (in kJ mol

) of the substance is ____________.

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When one glucose unit from glycogen gets converted to lactate in the muscle, the net number of ATP molecules produced is ________.

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Considering that the three pK

s of histidine are pK

=1.8, pK

=9.2 and pK

=6.0, its isoelectric point will be ___________ (rounded off to one decimal place).

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GATE XL format:nat PYQs

Question 20

Question 3

Question 4

Question 5

Question 12

Question 13

Question 14

Question 15

Question 9

Question 10