The compound that acts as an inhibitor for knocking in the combustion of petrol is:

1. (C₂H₅)₄Pb                     

2. Ni(CO)₄

3. Both (1) and (2)             

4. None of the above.

A negative catalyst or inhibitor is one:

1. which retards the rate of reaction

2. takes the reaction in forward direction

3. promotes the side reaction

4. None of the above

When a catalyst is added to a system the:

1. equilibrium concentrations are increased

2. equilibrium concentrations are unchanged

3. the rate of forward reaction is increased and that of backward reaction is decreases

4. value of the equilibrium constant is decreased

Pd can adsorb 900 times its volume of hydrogen. This called:

1. Absorption

2. Adsorption

3. Occlusion

4. Both 2, and 3

Which acts as poison for Pd-charcoal in lindlar's catalyst ?

1. BaSO₄

2. Quiniline

3. Both 1. and 2.

4. None of these