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Seawater contains many salts dissolved in it. Common salt is separated from these salts. Deposits of solid salt are also found in several parts of the world. These large crystals are often brown due to impurities. This is called rock salt and is mined like coal. The common salt is an important raw material for chemicals of daily use.
Consider the following compounds : FeSO₄ ; CuSO₄ ; CaSO₄ ; Na₂CO₃ The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :
In one formula unit of salt 'X', seven molecules of water of crystallisation are present. The salt 'X' is :
A few crystals of ferrous sulphate were taken in a dry boiling tube and heated. Tiny water droplets were observed in the tube after some time.
When acid present in tamarind is mixed with X, mixture Y is formed. When Y is mixed in the kneaded flour dough and heated, the cake formed becomes soft and spongy. X is prepared from common salt and is also used for faster cooking.
Write the common name and the chemical name of the compound CaSO₄ · ½H₂O. Write the method of its preparation. Give chemical equation for the reaction, when water reacts with CaSO₄ · ½H₂O.
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