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JEE CHEMISTRY MCQ: STATES OF MATTER

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Application +4 | -1

A flask contains

12 \mathrm{~g}

of a gas of relative molecular mass 120 at a pressure of

100 \mathrm{~atm}

was evacuated by means of a pump until the pressure was

0.01 \mathrm{~atm}

. Which of the following is the best estimate of the number of molecules left in the flask

\left(\mathrm{N}_0=6 \times 10^{23} \mathrm{~mol}^{-1}\right)

.

View answer and explanation

Correct option: B

6 \times 10^{18}

Option B (

6 \times 10^{18}

) is correct because it is calculated using the ratio of pressures to find the number of moles remaining and then multiplying by Avogadro's number.

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A quantity of hydrogen gas occupies a volume of

30 \mathrm{~mL}

at a certain temperature and pressure. What volume would half this mass of hydrogen occupy at triple the absolute temperature and the pressure were one-ninth that of the original gas? In deriving the kinetic equation we make use of the root mean square speed of the molecules which is: Consider the following statements for kinetic molecular theory of gases
a. Particles of a gas move in all possible directions in straight lines.
b. At any particular time, different particles in the gas have different kinetic energies.
c. Collisions of gas molecules are perfectly inelastic in nature.
The correct statement(s) is/are The compressibility factor of an ideal gas is The relative strength of interionic/intermolecular forces in decreasing order is Compressibility factor of an ideal gas is