NCERT Class XI Chemistry The s-Block Elements Solutions
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Question : 17
Total: 32
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) Mg burns with dazzling brilliance evolving a lot of heat.
2Mg +O 2 N 2 M g 3 N 2
(ii) When quicklime (CaO) is heated with silica, it forms calcium silicate( C a S i O 3 )
CaO +S i O 2 C a S i O 3
(iii) Chlorine reacts with slaked lime to give bleaching powder.
+ 2 C l 2 ( g )
+ 2 H 2 O
(iv) When calcium nitrate is heated, it decomposes to form calcium oxide, nitrogen dioxide and oxygen.
2 C a ( N O 3 ) 2 2 C a O + 4 N O 2 + O 2
2Mg +
(ii) When quicklime (CaO) is heated with silica, it forms calcium silicate
CaO +
(iii) Chlorine reacts with slaked lime to give bleaching powder.
(iv) When calcium nitrate is heated, it decomposes to form calcium oxide, nitrogen dioxide and oxygen.
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