First slide

Hydrogen

Question

Hydrogen is not obtained when zinc reacts with

Easy

A

Cold water
B

Hot NaOH solution
C

Conc. sulphuric acid
D

dilute HCl

Solution

$Zn + H_{2} O \to ZnO + H_{2} Zn + 2 NaOH \to {Na}_{2} {ZnO}_{2} + H_{2} Zn + 2 H_{2} {SO}_{4} \to {ZnSO}_{4} + {SO}_{2} + 2 H_{2} O Zn + 2 HCl \to {ZnCl}_{2} + H_{2}$

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