States Of Matter PYQ - Physical Chemistry

Among the following the maximum deviation from ideal gas behaviour is expected from

The density of an ideal gas can be given by ........, where p, V, M, T and R respectively denote pressure, volume, molar-mass, temperature and universal gas constant.

Which of the following graphs correctly represents Boyle’s Law?

When the temperature of a gas is increased from \(30^{\circ} \mathrm{C}\) to \(930^{\circ} \mathrm{C}\), the root mean square speed of the gas would

Three flasks of equal volume contain \(\mathrm{CH}_4, \mathrm{CO}_2\) and \(\mathrm{Cl}_2\) gases respectively. They will contain equal number of molecules, if

Which among the following statements is/are incorrect regarding real gases?

(i) Their compressibility factor is never equal to unity (Z \(\ne\) 1).

(ii) The deviations from ideal behaviour are less at low pressures and high temperatures.

(iii) Intermolecular forces among gas molecules are equal to zero.

(iv) They obey van der Waals’ equation, \(pV = nRT\)

Among the gases a, b, c , d, e and f, the gases that show only positive deviation from ideal behaviour at all pressures in the graph are

Identify the correct variation of pressure and volume of a real gas \((A)\) and an ideal gas (\(B\)) at constant temperature. \((y=p ; x=V)\)

The gaseous mixture used for welding of metals is

Given below are two statements.

Statement I : Viscosity of liquid decreases with increase in temperature.

Statement II : The units of viscosity are $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-1}$.

The correct answer is

Two statement are given below.

Statement I : The ratio of the molar volume of a gas to that of an ideal gas at constant temperature and pressure is called the compressibility factor.

Statement II : The rms velocity of a gas is directly proportional to square root of $T(\mathrm{~K})$.

The correct answer is

At $T(\mathrm{~K})$, the $p, V$ and $u_{\mathrm{rms}}$ of 1 mole of an ideal gas were measured. The following graph is obtained. What is it slope ( $m$ )?

( $x$-axis $=p V: y$-axis $u_{\mathrm{rms}}^2, M=$ Molar mass $)$

Two statements are given below.

Statement I : Viscosity of liquid decreases with increase in temperature.

Statement II : The units of viscosity coefficient are pascal.

The correct answer is

The RMS velocity ( $u_{\mathrm{rms}}$ ) of one mole of an ideal gas was measured at different temperatures and the following graph is obtained. What is the slope $(m)$ of straight line ?

$$\begin{aligned} & \left(X \text {-axis }=T(\mathrm{~K}): Y \text {-axis }=\left(u_{\mathrm{rms}}\right)^2: M=\right.\text { molar mass : } \\ & R=\text { gas constant } \end{aligned}$$