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  4. Which of he following dissolves in hot conc. NaOH solution?

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Q. Which of he following dissolves in hot conc. $ NaOH $ solution?

JIPMERJIPMER 2004

Solution:

Zinc is quite reactive metal. It dissolves in excess of hot $NaOH$ to give sodium zincate.
$Zn +2 NaOH \longrightarrow \underset{\text{sodium zincate}}{Na _{2} ZnO _{2}+ H _{2} \uparrow}$