Which acts as inhibitor for knocking in combustion of petrol?

(a) (C2H5)4Pb                     (b) Ni(CO)4

(c) both (a) and (b)              (d) none of these

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Negative catalyst or inhibitor is one:

(a) which retards the rate of reaction

(b) takes the reaction in forward direction

(c) promotes the side reaction

(d) none of the above

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When a catalyst is added to a system the:

(a) equilibrium concentrations are increased

(b)equilibrium concentrations are unchanged

(c) the rate of forward reaction is increased and that of backward reaction is decreases

(d)value of equilibrium constant is decreased

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Which acts as a promoter for nickel in the hydrogenation of oils ?

(a) Cu

(b) Mo

(c) Fe

(d) Pt

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In Zeigler-Natta polymerisation of ethylene, the active species is:

(1)AlCl3

(2)Et3Al

(3)CH2CH2

(4)TiIII

 

 

 

 

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The decomposition of H2O2 may be checked by adding a small quantity of phosphoric acid. This is an example of:

(a) neutralization                              (b) negative catalysis

(c) positive catalysis                         (d) catalytic poisoning

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

(a) absorption

(b)adsorption

(c)occlusion

(d) both (b) and(c)

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

(a) BaSO4

(b) Quiniline

(c) Both (a) and (b)

(d) None of these

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

(a) heterogeneous catalyst                    (b) auto-catalyst

(c) homo-catalyst                                 (d) induced catalyst

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In a reversible reaction, a catalyst:

(a) increases the rate of the forward reaction only

(b) increases the rate of the forward reaction to a greater extent than that of  the backward reaction

(c) increases the rate of the forward reaction and decreases that of the backward reaction to the different extent

(d) increases the rate of the forward and backward reactions equally

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