Question

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is

• A. 1:01
• B. 1:02
• C. 2:01
• D. 9:04

Answer 1

Answer: (A)

1:01

Answer 2

The balanced chemical reaction of zinc with sulphuric acid and
NaOH are
Zn + $H_2SO_4 \, \rightarrow \, ZnSO_4 + H2(g) \uparrow$
$Zn + 2NaOH + 2H_2O \rightarrow Na_2[Zn(OH)_4] + H_2 (g) \uparrow$
Since, one mole of$H_2(g)$ is produced per mole of zinc with both
sulphuric acid and NaOH respectively, hydrogen gas is produced in
the molar ratio of 1:1 in the above reactions.