The cotterells precipitator is used to :

1. neutralize charge on carbon particles in air in smoke

2. coagulate carbon atoms of smoke

3. bring in cataphoresis in carbon particles

4. all of the above

The gas that is adsorbed strongly by charcoal is: 

1. CO₂                               

2. N₂

3. H₂                                 

4. NH₃

Which ion is adsorbed when a diluted aqueous solution of AgNO₃ (excess) is added to KI solution, resulting in formation of positively charged sol particles of AgI?

1. K⁺

2. Ag⁺

3. I^-

4. NO₃^-

The phenomenon in which adsorption and absorption takes place simultaneously is called:

1. Desorption                       

2. Sorption

3. Both 1 and 2              

4. None of these

Gas masks containing activated charcoal remove poisonous gases from the atmosphere, and act on the principle of:

1. Adsorption

2. Absorption

3. Sorption

4. All of these

Chemisorption is:

1. multimolecular in nature

2. reversible

3. often highly specific and directional

4. not very specific

Adsorption is accompanied by:

1. decrease in entropy of the system

2. decrease in enthalpy of the system

3. T$∆$S for the process is negative

4. all of the above

Which of the following is not applicable to chemisorption?

1. Its heat of adsorption is high

2. It takes place at high temperature

3. It is reversible

4. It forms unimolecular layer

Which one of the following characteristics is associated with adsorption?

(1) $∆$G, $∆$H and $∆$S all are negative

(2) $∆$G and $∆$H are negative but $∆$S is positive

(3) $∆$G and $∆$S are negative but $∆$H is positive

(4) $∆$G is negative but $∆$H and $∆$S are positive

A plot of log x/m verses log p for the adsorption of a gas on a solid gives a straight line with slope equal to:-

(1) -log k

(2) n

(3) 1/n

(4) log k