s-Block ElementsHard

Question

Chemical (X) is used for :
(i) the production of sodium hydroxide
(ii) the manufacturing of bleaching powder
(iii) for the extraction of magnesium from sea water. What is the chemical formula of (X)?

Options

A.Ca(OH)2
B.CaO
C.Ca(HCO3)2
D.CaCO3

Solution

(i) Ca(OH)2 + Na2CO3 → CaCO3 + NaOH
(ii) 3Ca(OH)2 + 2Cl2 → Ca(OCl)2.Ca(OH)2. CaCl2.2H2O (bleaching powder).
(iii) MgCl2 (from sea water) + Ca(OH)2 →  Mg(OH)2 ↓ + CaCl2 (Dow′s process)

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