Mole ConceptHard
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 :
Options
A.1 : 1
B.1 : 2
C.2 : 1
D.9 : 4
Solution
VH2 ∞ nH2 [at constant P and T]
Zn + H2SO4 → ZnSO4 + H2
Zn + 2NaOH → Na2 ZnO2 + H2
Zn + H2SO4 → ZnSO4 + H2
Zn + 2NaOH → Na2 ZnO2 + H2
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