Question

Metal which reacts with sodium hydroxide to form hydrogen

Answer 1

When alkali (base) reacts with metal, it produces salt and hydrogen gas.

Example: Sodium hydroxide gives hydrogen gas and sodium zincate when reacts with zinc metal. Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.

Answer 2

No metal reacts with NaOH to give hydrogen
Non metals oxides react with it to give hydrogen