Important Questions of States of Matter Chemistry | Zigya

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191.

As the temperature is raised from 20°C to 40°C, the average kinetic energy of neon atoms changes by a factor of which of the following?

  • 1/2

  • 2

  • 313/293

  • 313/293

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192.

In Vander Waals equation of state of the gas law, the constant ‘b’ is a measure of 

  • intermolecular repulsions

  • intermolecular collisions per unit volume

  • Volume occupied by the molecules

  • Volume occupied by the molecules

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193.

An ideal gas expands in volume from 1×10-3 m3 to 1×10-2 m3 at 300 K against a constant pressure of 1×105 Nm-2. The work done is

  • -900 J

  • 900 J

  • 2780 J

  • 2780 J

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194.

For same mass of two different ideal gases of molecular weights M1 and M2, Plots of log V vs log p at a given constant temperature are shown. Identify the correct option.

  • M1 > M2

  • M1 = M2

  • M1 < M2

  • Can be predicted only if temeperature is known


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195.

Which of the following has the dimension if [ML0T-2]?

  • Coefficient of viscosity

  • Surface tension

  • Vapour pressure

  • Kinetic energy


196.

The boiling points of HF, HCl, HBr and HI follow the order

  • HF> HCl > HBr > HI

  • HF> HI> HBr > HCl

  • HI> HBr > HCl> H

  • HCl > HF> HBr > HI


197.

At a certain temperature, the value of the slope of the plot of osmotic pressure (π) against concentration (C in molL-1) of a certain polymer solution is 291R. The temperature at which osmotic pressure is measured, is (R is gas constant)

  • 271°C

  • 18°C

  • 564 K

  • 18 K


198.

For one mole of an ideal gas, the slope of V vs. T curve at constant pressure of 2 atm is X L mol-1 K-1.The value of the ideal universal gas constant 'R' in terms of X is

  • X L atm  mol-1 K-1

  • x/2 L atm  mol-1 K-1

  • 2X L atm  mol-1 K-1

  • 2X atm L-1 mol-1 K-1


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199.

At a certain temperature the time-required for the complete diffusion of 200 mL of H2 gas is 30 min. The time required for the complete diffusion of 50 mL of O2 gas at the same temperature will be

  • 60min

  • 30min

  • 45min

  • 15min


200.

The RMS velocity of CO gas molecules at 27°C is approximately 1000 m/s. For N2 molecules at 600 K, the RMS velocity is approximately

  • 2000 m/s

  • 1414 m/s

  • 1000 m/s

  • 1500 m/s


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