s-Block ElementsHard

Question

Slaked lime, Ca(OH)2 is used :

Options

A.in the manufacture of sodium hydroxide.
B.in the manufacture of bleaching powder.
C.in the preparation of ammonia from ammonium salts.
D.in the detection of carbondioxide gas.

Solution

(A) Na2CO3 + Ca(OH)2 → CaCO3 ↓ (white) + 2NaOH.
(B) 3Ca(OH)2 + 2Cl2 → Ca(OCl)2.Ca(OH)2.CaCl2.2H2O.
(C) 2NH4Cl + Ca(OH)2 →  2NH3 + CaCl2 + 2H2O.
(D) Ca(OH)2 + CO2 →  CaCO3 ↓ (milkiness).

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