Question

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?

Solution

(i) Magnesium on burning in the air gives magnesium oxide.

2 Mg left parenthesis straight s right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis space rightwards arrow with Heat on top space 2 MgO left parenthesis straight s right parenthesis

(ii) Quick- lime on heating with silica (SiO₂) gives calcium silicate.

stack CaO left parenthesis straight s right parenthesis with Quick space lime below space plus space stack SiO subscript 2 left parenthesis straight s right parenthesis with Silica below space rightwards arrow space space stack CaSiO subscript 3 left parenthesis straight s right parenthesis with Calcium space silicate below

(iii) Chlorine reacts with slaked lime to form calcium hypochlorite.

2 Cl subscript 2 space plus space stack 2 Ca left parenthesis OH right parenthesis subscript 2 with Slaked space lime below space space rightwards arrow space stack space CaCl subscript 2 space plus space Ca left parenthesis OCl right parenthesis subscript 2 with Bleaching space powder below space plus space 2 straight H subscript 2 straight O

(iv) Calcium nitrate on heating gives nitrogen dioxide.

2 Ca left parenthesis NO subscript 3 right parenthesis subscript 2 space rightwards arrow with Heat on top space 2 CaO left parenthesis straight s right parenthesis space plus space 4 NO subscript 2 left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis

Some More Questions From The s-Block Elements Chapter

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