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

The active species in Zeigler-Natta polymerisation of ethylene is:

1. AlCl₃

2. Et₃Al

3. H₂C=CH₂

4. Ti⁺³

A small amount of phosphoric acid can be used to prevent H₂O₂ decomposition. This an example of?

1. Neutralization                             

2. Negative catalysis

3. Positive catalysis                         

4. Catalytic poisoning

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

Platinized asbestos used as a catalyst in the manufacture of H₂SO₄ is an example of:

1. heterogeneous catalyst                   

2. auto-catalyst

3. homo-catalyst                                 

4. induced catalyst

In a reversible reaction, a catalyst:

1. increases the rate of the forward reaction only

2. increases the rate of the forward reaction to a greater extent than that of  the backward reaction

3. increases the rate of the forward reaction and decreases that of the backward reaction to the different extent

4. increases the rate of the forward and backward reactions equally

The catalyst used in the lead-chamber process of sulphuric acid is:

1. platinum

2. nitric oxide

3. nickel

4. vanadium pentoxide