GATE CY 2020 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

Assuming no interaction between vibrational and rotational energy levels in HF, the frequency (in cm

, rounded off to the nearest integer) of the R branch line originating from

in its IR spectrum is ______

(Given: Rotational constant for HF = 19.35 cm

;

)

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The van der Waals constants

and

for gaseous CO are given as 1.49 L

atm mol

and 0.039 L mol

, respectively. The fugacity (in atm, rounded off to two decimal places) of CO at 35 °C and 95 atm is ________ (Given:

L atm K

mol

)

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At 30 °C, the vapor pressure and density of a 1.0 M aqueous solution of sucrose are 31.207 mm Hg and 1.1256 g/mL, respectively. If the vapor pressure of pure water at 30 °C is 31.824 mm Hg, the activity coefficient (rounded off to three decimal places) of water in the given solution is ________ (Given: The molar mass of sucrose = 342.3 g mol

)

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2020 · Paper 1

Question 51

Question 52

Question 53