Question

34.
i) On strong heating blue copper sulphate crystals turn white, why?
5
ii) What is the commercial name of Calcium sulphate hemihydrates?
iii) What do you mean by the Olfactory indicator?
iv) Why does dry HCl gas not change the colour of the dry litmus paper?
v) A solution reacts with crushed egg-shells to give a gas that turns lime water
milky. The solution contains
a) NaCl
b)HC c)Lici d)KCI​

Answer 1

Answer:

I) copper sulphate crystals contain water of crystallisation. when heated strongly this water of crystallisaton is removed and the crystals turn white.

2)plaster of Paris

3) olfactory indicators are substances whose odour changes in acidic or basic media.

Answer 2

Answer:

answer v--HCL

Explanation:

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