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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Solution

(i) Magnesium is burnt in air to form magnesium oxide and magnesium nitride.
$2 M g + O_{2} \to 2 M g O$
$3 M g + N_{2} \to M g_{3} N_{2}$ .
(ii) Quick lime is heated with silica to obtain calcium silicate
$C a O + S i O_{2} above 1273 K - ------- \to C a S i O_{3}$ .

(iii) Chlorine reacts with slaked lime to form calcium hypochlorite- a constituent of bleaching powder.
$2 C a (O H)_{2} + 2 C l_{2} \to C a C l_{2} + C a (O C l)_{2} B l e a c h i n g p o w d e r + 2 H_{2} O$ .

(iv) Calcium nitrate is heated to obtain $C a O, N O_{2}$ and $O_{2}$ .
$2 C a (N O_{3})_{2} \to 2 C a O + 4 N O_{2} + O_{2}$ .

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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

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