Four gases P, Q, R and S have almost same values of 'b' but their

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 Multiple Choice QuestionsMultiple Choice Questions

411.

A gas can be liquefied at temperature T and pressure p provided

  • T = Tc and p < pc

  • T < Tc and p > pc

  • T > Tc and p > pc

  • T > Tc and p < pc


412.

The dispersed phase and dispersion medium of fog respectively are

  • solid, liquid

  • liquid, liquid

  • liquid, gas

  • gas, liquid


413.

The units of surface tension and viscosity of liquids respectively are

  • kg m-1s-1, Nm-1

  • kg s-2, kg m-1 s-1

  • Nm-1, kg m-1s-2

  • kg s-1, kg m-2s-1


414.

Assertion : CHCl3 and CH3OH are miscible.

Reason : One of them is polar.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

  • If Assertion is true but Reason is false.

  • If Assertion is false but Reason is true.


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415.

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

  • X2L atm mol-1 K-1

  • 2X L atm mol-1 K-1

  • 2 X atm L-1 mol-1 K-1


416.

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

  • 60 min

  • 30 min

  • 45 min

  • 15 min


417.

Assertion: An increase in surface area increases the rate of evaporation.
Reason: Stronger the intermolecular attractive forces, fast is the rate of evaporation at a given temperature.

  • If both assertion and reason are true and reason is a correct explanation of the assertion.

  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


418.

Assertion: Atoms can neither be created nor destroyed.
Reason: Under the similar condition of temperature and pressure, an equal volume of gases does not contain an equal number of atoms.

  • If both assertion and reason are true and reason is a correct explanation of the assertion.

  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


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419.

Equal weights of CH3 and H2 are mixed in an empty container at 25°C. the fraction of the total pressure exerted by H2 is:

  • 1/9

  • 1/2

  • 8/9

  • 16/17


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420.

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are van der Waals' constants) are in the order Q < R < S < P. At a particular temperature, among the four gases, the most easily liquefiable one is

  • P

  • Q

  • R

  • S


A.

P

Higher the value of 'a', more will be the tendency to get liquefy. Since, value of 'a' is highest for P1 thus, P is the most liquefiable gas among the given


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