Question

For the following Assertion and Reason, pick the correct option

Assertion: For hydrogenation reactions, the catalytic activity increases from group-5 to group11 metals with maximum activity shown by group 7-9 elements

Reason: The reactants are most strongly adsorbed on group 7-9 elements

• A. a. Both assertion and reason are false.
• B. b. The assertion is true, but the reason is false.
• C. c. Both assertion and reason are true, but the reason is not the correct explanation of assertion
• D. d. Both assertion and reason are true and the reason is the correct explanation of assertion

Answer 1

The correct option is A

a. Both assertion and reason are false.

Answer (1) Both assertion and reason is the correct explanation for assertion

Reason-The reactants are most strongly adsorbed on group $7-9$ elements, as for hydrogenation reaction, the general trend of catalytic activity increase from 5 to group 11 metals with maximum activity shown by group $7-9$ element.

For $5-11$ group Catalytic activity also depends upon adsorption of reactants on the surface of catalyst.

For $7-9$ group elements, catalytic activity becomes maximum, this is due to to the fact that catalytic activity depends on variable oxidation states as well as atomic size. It largely depends upon rate of adsorption, equilibrium adsorption and surface reaction rate coefficients.