Q12) i) In one of the industrial processes used for manufacture of Sodium
hydroxide, a gas X is formed as by product. The gas X reacts with lime water
to give a compound Y which is used as a bleaching agent in chemical industry.
Identify X and Y giving the chemical equation of the reaction involved. ii) How
is plaster of paris prepared? Give the equation of the reaction involved. OR i)
How can you test the presence of water of crystallisation in crystalline copper
sulphate? Explain with the help of an activity and a labelled diagram. (5)
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