Which is lighter than dry air?

1. Moist air                             

2. SO₂

3. Cl₂                                      

4. O₂

The condition of SATP refers to:

1. 25 $°$C and 2 atm             

2. 25 $°$C  and 1 atm

3. 0 $°$C  and 2 atm             

4. 25 $°$C  and 1 bar

 A = $\frac{{\mathrm{pV}}^2{\mathrm{T}}^2}{\mathrm{n}}$ 

The SI unit for the quantity A is -

1. $\mathrm{N} {\mathrm{m}}^2 {\mathrm{K}}^2 {\mathrm{mol}}^{-1}$

2. $\mathrm{N} {\mathrm{m}}^4 \mathrm{K} {\mathrm{mol}}^{-1}$

3. $\mathrm{N} {\mathrm{m}}^2 {\mathrm{K}}^3 {\mathrm{mol}}^{-1}$ 

4. $\mathrm{N} {\mathrm{m}}^4 {\mathrm{K}}^2{\mathrm{mol}}^{-1}$

A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. The partial pressure of dihydrogen is -

1. 0.2 bar

2. 0.7 bar

3. 0.8 bar

4. 0.6 bar

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles. Their magnitude depends upon-

1. Charge of interacting particles.

2. Mass of interacting particles.

3. Polarizability of interacting particles.

4. Strength of permanent dipoles in the particles.

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess 'partial charges'.

The partial charge will be-

1. More than unit electronic charge.

2. Equal to unit electronic charge.

3. Less than unit electronic charge.

4. Double the unit electronic charge.