For the following Assertion and Reason, the correct option is :
Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group 7-9 elements.
Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group 7-9 elements.
- (A)Assertion is not true, but reason is true
- (B)Both assertion and reason are false
- (C)Both assertion and reason are true, but the reason is not the correct explanation for the assertion
- (D)Both assertion and reason are true, and the reason is the correct explanation for the assertion✓ Correct
Answer: (D)
Solution
For hydrogenation the transition metals grow more active across the series from Group 5 toward Group 11, with the greatest activity in the Group 7-9 metals, because these adsorb the reactants with just the right strength: firm enough to activate hydrogen and the substrate, yet loose enough to release the product. Since this optimal adsorption on the Group 7-9 metals is exactly what makes them the best catalysts, both the assertion and the reason are true and the reason correctly explains the assertion.
JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Single correct option