10.17. What happens when (i) magnesium is burnt in air, (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated?
10.17. What happens when (i) magnesium is burnt in air, (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated?
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1 Answer
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(i) Magnesium is burnt in air to form magnesium oxide and magnesium nitride.
2Mg + O2 → 2MgO
3Mg + N2 → Mg3N2.
(ii) Quick lime is heated with silica above 1273 K to obtain calcium silicate
CaO+SiO2 → CaSiO3.
(iii) Chlorine reacts with slaked lime to form calcium hypochlorite- a constituent of bleaching powder.
2Ca (OH)2 + 2Cl2 → CaCl2 + Ca (OCl)2 + 2H2O.
(iv) Calcium nitrate is heated to obtain CaO, NO2 and O2.
2Ca (NO3)2→2CaO+4NO2+O2.
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