Question

(a) A solution of substance ‘X’ is used for white washing. What is the substance ‘X’? State the chemical reaction of ‘X’ with water.
(b) Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Answer 1

Answer:

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Explanation:

(a) ‘X’ is calcium oxide (CaO).

CaO(s) + H2O(l) —–> Ca(OH)2(aq) + heat

(a) It is because iron displaces copper from CuS04 to form FeS04 which is pale green.

Fe(s) + CUS04 (aq)—–> FeS04(aq) + Cu(s)

Blue                       Pale green

Answer 2

Answer:

Explanation:

(a) ‘X’ is calcium oxide (CaO).

CaO(s) + H2O(l) —–> Ca(OH)2(aq) + heat

(b) It is because iron displaces copper from CuS04 to form FeS04 which is pale green.

Fe(s) + CUS04 (aq)—–> FeS04(aq) + Cu(s)

Blue                       Pale green