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Physics MCQs for NEET — Practice Questions with Answers

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A mixture contains $ N_2O_4 and NO_2 $ in the ratio 2 : 1 by volume. The vapour density of the mixture is

A. 45.4 B. 49.8 C. 32.6 D. 38.3

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At extremely low pressure, the vander waals equation for one mole of a gas may be written as

A. PV =RT + pb B. $ PV = RT - { a \over v } $ C. PV = RT D. $ ( p + {a \over v } ( v -b ) = RT $

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The compressibility of a gas is less than unity at STP Therefore

A. Vm > 22.4 L B. Vm < 22.4 Litre C. Vm = 22.4 L D. Vm = 44.8 Litre

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The correct order for magnitude of vanderwaals constant b should be

A. $ C_2 H_6 \lt CO \lt CO_2 \lt He $ B. $ CO \lt C_2H_6 \lt He \lt CO_2 $ C. $ C_2 H_6 \lt CO_2 \lt CO \lt He $ D. $ He \lt CO \lt CO_2 \lt C_2H_6 $

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The molecular radius of $O_2 is 2.88 \times 10^{-10} m calculate the excluded volume per mol of O_2 $

A. $ 0.24 dm^3 $ B. $ 0.48 dm ^ 3 $ C. $ 0.024 dm ^3 $ D. $ 0.048 dm ^ 3 $

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An ideal gas cannot be liquefied because

A. The intermolecular force of attraction between the gaseous molecules are negligible. B. Its critical temperature is very high C. The vanderwaals constants a and b are very high D. Of all of these

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The values of â€˜aâ€™ for the gases $ O_2 , CO_2, N_2 and CH_4 $ are respectively 1.36, 3.64, 1.39 and 2.253 $L^2 atm mol^{-1} $ which gas can be most easily liquefied?

A. $ O_2 $ B. $ CO_2 $ C. $ N_2 $ D. $ CH_4 $

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The rate of diffusion of $H_2$ is about

A. 1/2 that of He B. 1.4 times that of He C. Twice that of He D. 4 times that of He

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At room temperature the mixture of $ SO_2 and O_2 gas, compared to the O_2 molecule, the SO_2 $ molecule will hit the wall with..

A. Smaller avarage speed B. Greater average speed C. Greater kinetic energy D. Greater mass

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Which has maximum value of mean free path ?

A. $ CO_2 $ B. $ H_2 $ C. $ O_2 $ D. $ N_2 $

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