Question

When some amount of zinc is treated separately with an excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved will be:

• A. $1:1$
• B. $1:2$
• C. $2:1$
• D. $2:3$

Answer 1

The correct option is A $1:1$

When some amount of zinc is treated separately with an excess of sulphuric acid and excess of sodium hydroxide solution, the following reactions take place:

$Zn+2NaOH\to N{a}_{2}Zn{O}_2+H_2$

$Zn+H_{2}S{O}_4\left(dil\right)\to ZnS{O}_4+H_2$

The ratio of volume of hydrogen gas evolved : $1:1$

Hence, option $A$ is correct.