Question

Match the columns:
Column A Column B
(i) Elements react violently with acid A. Cu
(ii) Elements less reactive than hydrogen B. Na
(iii) Negative catalyst C. MnO₂
(iv) Positive catalyst D. Mo
(v) Promoter E. H₃P₄

Answer 1

(I) will match with B.

Na reacts violently with acid.

(II) will match with A.

Cu has reactivity less than that of hydrogen. Cu cannot displace hydrogen from water or acid .

(III) will match with E.

H3P4 acts as a negative catalyst . A negative catalyst slows down a reaction by reducing the activation energy required for the reaction.

(IV) will match with C.

MnO2 is a positive catalyst . A positive catalyst increases the rate of reaction by increasing the activation energy .

(V) will match with D.

Mo is a promoter . Promoter is a substance added to a catalyst to improve it's performance in a reaction.