For the dissociation of PCl₅ into PCl₃ and Cl₂ in gaseous phase reaction, if d is the observed vapour density and D the theoretical vapour density with 'a' as degree of dissociation. Variation of D/d with 'a' is given by which graph

1. 

2. 

3. 

4. Any of these

At $100°\mathrm{C}$ the vapour density of nitrogen peroxide (N₂O₄) is 26.8. The percentage dissociation into NO₂ molecules is

1. 71.64%

2. 61.57%

3. 83.56%

4. 67.39%

The vapour density of N₂O₄ at a certain temperature is 30. What is the percentage dissociation of N₂O₄ at this temperature?

1. 53.3

2. 106.6

3. 26.7

4. none of these

What is the correct sequence of active masses in increasing order in gaseous mixture, containing one gram per litre of each of the following?

I. NH₃

II. N₂

III. H₂

IV. O₂

Select the correct answer using the codes given below:

1. III, I, IV, II

2. III, IV, II, I

3. II, I, IV, III

4. IV, II, I, III

Heating a saturated sodium chloride solution leads to:

1. Saturation being maintained

2. The solution becomes unsaturated

3. Solution becoming supersaturated

4. The system reaching an equilibrium point

The graph among the following that represents Henry's Law is -

1.   

2.

3.

4.  

ln liquid ${\mathrm{CCl}}_4$ which of the following has maximum solubility?

(1) l₂

(2) Br₂

(3) NaCl

(4) Cl₂

Which of the following represents a metastable system?

1. an unsaturated solution 

2. a dilute solution

3. a saturated solution 

4. a supersaturated solution 

The relative lowering of vapor pressure upon dissolving a non-volatile solute in a solvent is equal to:

1. Mole fraction of the solute 

2. Mole fraction of the solvent 

3. Concentration of the solute in grams per liter 

4. Concentration of the solute in grams per 100 mL

Van't Hoff factor is 

(1) More than one in case of association 

(2) Less than one in case of dissociation 

(3) Equal to $\frac{normal molecular mass}{observed molecular mass}$
$$

(4) Equal to $\frac{observed molecular mass}{normal molecular mass}$