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Give reasons for the following: (i) Only one half of water molecule is shown in the formula of plaster of Paris. (ii) Sodium hydrogen carbonate

Give reasons for the following:
(i) Only one half of water molecule is shown in the formula of plaster of Paris.
(ii) Sodium hydrogen carbonate is used as an antacid.
(iii) On strong heating, blue coloured copper sulphate crystals turn white.

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