Chemistry
Hydrogen is obtained by displacement from
(a) dilute sulphuric acid
(b) dilute hydrochloric acid
Write equations using zinc and iron.
Why does not copper show similar behaviour?
Hydrogen
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Answer
(a) dilute sulphuric acid
Zn + H2SO4 (dil.) ⟶ ZnSO4 + H2 ↑
Fe + H2SO4 (dil.) ⟶ FeSO4 + H2 ↑
(b) dilute hydrochloric acid
Zn + 2HCl (dil.) ⟶ ZnCl2 + H2 ↑
Fe + 2HCl (dil.) ⟶ FeCl2 + H2 ↑
Zinc and iron are above hydrogen in activity series of metals whereas copper is below hydrogen in the series. As metals below hydrogen cannot displace it from dilute acids hence, copper does not show similar behaviour as zinc and iron.
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