MCQ
By annealing, steel
- ✓Becomes soft
- BBecomes liquid
- CBecomes hard and brittle
- DIs covered with a thin film of $F{e_3}{O_4}$
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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.