A gas at 350 K and 15 bar has a molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

1.	Z<1 and repulsive forces are dominant.
2.	Z>1 and attractive forces are dominant.
3.	Z>1 and repulsive forces are dominant.
4.	Z<1 and attractive forces are dominant.

40 milligram diatomic volatile substance $\left({\mathrm{X}}_2\right)$ is converted to vapour that displaced 4.92 mL of air at 1 atm and 300 K. Atomic weight of element X is nearly:

1.  400

2.  240

3.  200

4.  100

A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and 0$°\mathrm{C}$. At the same pressure but at
273$°\mathrm{C}$, its volume will be:

1.  0.4 litre

2.  0.8 litre

3.  27.8 litre

4.  55.6 litre

Which is the correct curve for Charle's law, when the curve is plotted at 0.821 atm pressure for a 10-mole ideal gas?

1.  

2.  

3.  

4.  

Which is not correct curve for gay-lusacc's law?

1 .  

2.     

3.   

4.     

A certain hydrate has the formula ${\mathrm{MgSO}}_4.$ ${\mathrm{xH}}_2\mathrm{O}$. A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the water vapour generated exerts a pressure of 24.8 atm in a 2.0 L container at 120$°\mathrm{C}$, the value of x is-

1.  2

2.  5

3.  6

4.  7

A mixture of Ne and Ar at 250 K has a total K.E.=3 kJ in a closed vessel, the total mass if Ne and Ar is 30 g. Find mass % of Ne in a gaseous mixture at 250 K.

1.  61.63 %

2.  38.37 %

3.  50 %

4.  28.3 %

In two vessels of 1 litre each at the same temperature 1 g of ${\mathrm{H}}_2$ and 1 g of ${\mathrm{CH}}_4$ are taken, for these:

1.  ${\mathrm{V}}_{\mathrm{rms}}$ values will be same

2.  Kinetic energy per mol will be same

3.  Total kinetic energy will be same

4.  Pressure will be same

Four particles have speed 2, 3, 4 and 5 cm/s respectively. Their rms speed is:

1.  $3.5 \mathrm{cm}/\mathrm{s}$

2.  $\left(27/2\right) \mathrm{cm}/\mathrm{s}$

3.  $\sqrt{54} \mathrm{cm}/\mathrm{s}$

4.  $\left(\sqrt{54}/2\right) \mathrm{cm}/\mathrm{s}$

A gaseous mixture contains 4 molecules with a velocity of $6 \mathrm{cm} {\sec }^{-1}$, 5 molecules with a velocity of $2 \mathrm{cm} {\sec }^{-1}$ and 10 molecules with a velocity of $3 \mathrm{cm} {\sec }^{-1}$. What is the RMS velocity of the gas:

1.  $2.5 \mathrm{cm} {\sec }^{-1}$

2.  $1.9 \mathrm{cm} {\sec }^{-1}$

3.  $3.6 \mathrm{cm} {\sec }^{-1}$

4.  $4.6 \mathrm{cm} {\sec }^{-1}$