pBlock ElementsII 2 Question 50
53. Write the balanced equations involved in the preparation of
(i) bleaching powder from slaked lime
(1979, 10M)
(ii) nitric oxide from nitric acid
(iii) chlorine from sodium chloride
(iv) anhydrous aluminium chloride from alumina
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Solution:
- (i) $\mathrm{Ca}(\mathrm{OH}){2}+\mathrm{Cl}{2} \xrightarrow{40^{\circ} \mathrm{C}} \mathrm{CaOCl}{2}+\mathrm{H}{2} \mathrm{O}$
(ii) $3 \mathrm{Cu}+8 \mathrm{HNO}{3}$ (dil) $\longrightarrow 3 \mathrm{Cu}\left(\mathrm{NO}{3}\right){2}+4 \mathrm{H}{2} \mathrm{O}+2 \mathrm{NO}$
(iii) $2 \mathrm{NaCl}+2 \mathrm{H}{2} \mathrm{SO}{4}+\mathrm{MnO}{2} \longrightarrow \mathrm{Na}{2} \mathrm{SO}{4}+\mathrm{MnSO}{4}$ $+2 \mathrm{H}{2} \mathrm{O}+\mathrm{Cl}{2}$
(iv) $\mathrm{Al}{2} \mathrm{O}{3}+3 \mathrm{C}+3 \mathrm{Cl}{2} \xrightarrow{\Delta} 2 \mathrm{AlCl}{3}+3 \mathrm{CO}$
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