Select the correct word from the list given in the bracket for each of the following statements.
Presence of impurities _____ (reduces/increases) the efficiency of a catalyst.

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Solution

Catalyst is a substance which increases the rate of the reaction without undergoing any change by itself.
Impurities may be present in a catalyst.
However, these impurities have to be removed so that catalyst can actively participate in the reaction.
In the presence of impurities, the foreign material will hinder catalyst activity, thereby decreasing rate of reaction.
Hence, Presence of impurities reduces the efficiency of a catalyst.

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Select the correct word from the list given in the bracket for each of the following statements.Presence of impurities _____ (reduces/increases) the efficiency of a catalyst.

Select the correct word from the list given in the bracket for each of the following statements.
Presence of impurities _____ (reduces/increases) the efficiency of a catalyst.