NEET Chemistry - New - States of Matter: Gases and Liquids

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Question - 1

The beans are cooked earlier in pressure cooker, because

  • A Boiling point increases with increasing pressure
  • B Boiling point decreases with increasing pressure
  • C Extra pressure of pressure cooker, softens the ANSWERS beans
  • D internal energy is not lost while cooking in pressure cooker

Question - 2

Which one of the following statement is wrong for gases?

  • A Gases do not have a definite shape and volume
  • B Volume of the gas is equal to volume of container confining the gas
  • C Confined gas exerts uniform pressure on the walls of its container in all directions
  • D Mass of a gas cannot be determined by weighing a container in which it is enclosed.

Question - 3

Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27\(\circ \)C in identical conditions. The rational of the volume of gases H2 : O2 : CH4 would be :

  • A 8: 16: 1
  • B 16: 8: 1
  • C 16: 1: 2
  • D 8: 1: 2

Question - 4

A gaseous mixture was prepared by taking equal moles of CO and N2. If the total pressure of the mixture was found 1 atm, the partial pressure of the nitrogen (N2) in the mixture is :

  • A 0.8 atm
  • B 0.9 atm
  • C 1 atm
  • D 0.5 atm

Question - 5

In Duma's method of estimation of nitrogen 0.35gm of an organic compound gave 55 ml of nitrogen collected at 300 K temperature and 715mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300K = 15mm)

  • A 16.45
  • B 17.45
  • C 14.45
  • D 15.45

Question - 6

Cyclopropane and oxygen at partial pressure 170 torr and 570 torr are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen?

  • A \(\frac { 170\times 42 }{ 570\times 32 } =0.39\)
  • B \(\frac { 170 }{ 42 } /\left( \frac { 170 }{ 42 } +\frac { 570 }{ 32 } \right) \approx 0.19\)
  • C \(\frac { 170 }{ 140 } \)=0.23
  • D \(\frac { 170 }{ 570 } \)=0.30

Question - 7

Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mol L-1? [R = 0.082 L atm mol-l deg -1]

  • A at STP
  • B When V = 22.4 L
  • C When T = 12K
  • D Impossible under any conditions.

Question - 8

The correct value of the gas constant 'R' is close to:

  • A 0.082 L atm K
  • B 0.082 L-atm K-l mol-l
  • C 0.082 L atm-l K mol-l
  • D 0.082 L-1 atm-l K mol

Question - 9

At constant temperature, in a given mass of ideal gas:

  • A The ratio of pressure and volume always remains constant
  • B Volume always remains constant
  • C Pressure always remains constant
  • D The product of pressure and volume always  remains constant

Question - 10

Pressure remaining the same, the volume of a given mass of an ideal gas increases for every degree centigrade rise in temperature by definite fraction of its volume at :

  • A O°C
  • B Absolute zero
  • C Its critical temperature
  • D Its Boyle's temperature