Chemistry
Name two alkalies that can displace hydrogen. Give balanced equations for the same. Why are the metals you have used considered to have unique nature?
Hydrogen
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Answer
NaOH and KOH
Zn + 2NaOH ⟶ Na2ZnO2 + H2 ↑
Zn + 2KOH ⟶ K2ZnO2 + H2 ↑
Zinc and aluminium are considered to have a unique nature because:
(i) They can react with acids and can even react with hot conc. alkalis to form hydrogen and a soluble salt.
Zn + 2HCl ⟶ ZnCl2 + H2
(ii) Their oxides and hydroxides are amphoteric in nature i.e., they react with both bases and acids to give salt and water.
ZnO + 2HCl ⟶ ZnCl2 + H2O
ZnO + 2NaOH ⟶ Na2ZnO2 + H2O
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Related Questions
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?
Give a reason for the following
(a) Though lead is above hydrogen in the activity series, it is not used to prepare hydrogen.
(b) Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
Complete and balance the following equations.
(a) Na + H2O ⟶ …………… + ……………
(b) Ca + H2O ⟶ …………… + ……………
(c) Mg + H2O ⟶ …………… + ……………
(d) Zn + H2O ⟶ …………… + ……………
(e) Fe + H2O ⟶ …………… + ……………
(f) Zn + HCl ⟶ …………… + ……………
(g) Al + H2SO4 ⟶ …………… + ……………
(h) Fe + HCl ⟶ …………… + ……………
(i) Zn + NaOH ⟶ …………… + ……………
(j) Al + KOH + H2O ⟶ …………… + ……………
If the following are kept in closed vessels at over 400°C what would happen to them ?
(a) iron filings and steam,
(b) hydrogen and magnetic oxide of iron ?