Question

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

• A. 1 : 1
• B. 1 : 2
• C. 2 : 1
• D. 9 : 4

Answer 1

Answer: (A)

1 : 1

Answer 2

Zn  +  H2SO4 $\longrightarrow$ZnSO4  +  H2

mole excess 1 mole

Zn  +  2NaOH $\longrightarrow$Na2ZnO2  +  H2

1 mole excess 1 mole

Ration of volume of hydrogen in both cases is 1 : 1.