A pair of metals which dissolves in sodium hydroxide solution is

One of the metals which reacts with hot sodium hydroxide solution to produce hydrogen gas is

When sodium hydroxide solution is electrolysed :

When sodium hydroxide solution is electrolysed :

Which one of the following metallic hydroxides does not dissolve in sodium hydroxide solution ?

Hydroxide of which metal is soluble in sodium hydroxide solution?

Choose the correct answer from the options given below : Hydroxide of this metal is soluble in sodium hydroxide solution.

From the list of metals given below, select a metal whose hydroxide is soluble in sodium hydroxide solution: List : Calcium, magnesium, iron, zinc.