JEE Chemistry - Gaseous state

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Question - 1

Calculate the number of moles of gas present in the container of volume 10 lit at 300 K. If the manometer containing glycerin shows 5m difference in level as shown in diagram.
Given: \(d_{\text {glycerin }}=2.72 \mathrm{gm} / \mathrm{ml}, d_{\text {mercury }}=13.6 \mathrm{gm} / \mathrm{ml}\)

  • A 1.23
  • B 0.94
  • C 10.2
  • D 4.23

Question - 2

A manometer attached to a flask contains NH3 gas have no difference in mercury level initially as shown in diagram. After the sparking into the flask, it have difference of 19 cm in mercury level in two columns. Calculate % dissociation of ammonia.

  • A 25.00
  • B 12.00
  • C 23.00
  • D 412.0

Question - 3

Into a gas bulb of 2.83 litres, are introduced 0.174 g of Hz and 1.365 g of Nz which can be assumed to behave ideally. The temperature is 0oC ? What is the total gas pressure ?

  • A 445.1
  • B 123.0
  • C 1.07
  • D 123.0

Question - 4

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 20 g and that of B is 18 g. The total pressure of the mixture is 750 mm. Calculate partial pressure of the B.

  • A 408.70
  • B 21.04
  • C 231.0
  • D 452.0

Question - 5

A gaseous mixture of He and O2 is found to have a density of 0.518 gL-r  at 25o C and 720 torr. what is the percent by mass of helium in this mixture ?

  • A 75.32
  • B 42.1
  • C 12.34
  • D 66.51

Question - 6

20 dm3 of SO2 diffuse through a porous partition in 60 S, what volume of O2 will diffuse under similar conditions in 30 S.

  • A 14.14
  • B 21.02
  • C 2.3
  • D 45.1

Question - 7

The density of an ideal gas A is 1.43 gm/lit at STP. Determine the density of A at 17o C and 700 torr (mm)

  • A 1.24
  • B 2.3
  • C 1.0
  • D 4.2

Question - 8

A cylinder containing 5.0 litre O2 at 25oC wae leaking. When the leakage was detected and stopped there was a change in the pressure of the gas from 3.0 atm to 2.240 atm, How much oxygen in g has been leaked during this period ?

  • A 2.3
  • B 42.1
  • C 4.97
  • D 3.21

Question - 9

A straight glass tube has two inlets X and Y at the two ends. The length of the tube is 200 cm. HCI gas at 1.2 atm ie sent through inlet X and NH3 gas at 1 atm through intel y is allowed to enter the tube at the same time. White fumes first appears at point L inside the tube. Find the distance L from X.

  • A 90.05
  • B 12.34
  • C 4.20
  • D 10.20

Question - 10

At 627oC and 1 atm pressure, SO3 undergoes partial dissociation into SO2 and O2
\(\mathrm{SO}_{3} \rightleftharpoons \mathrm{SO}_{2}+1 / 2 \mathrm{O}_{2}\)
If the observed density of the equilibrium mixture is 0.925 g/l, calculate degree of dissociation of SO3

  • A 33.50
  • B 12.0
  • C 45.2
  • D 78.0
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