Short Answer TypeWhen a piece of calcium metal is dropped into a beaker of cold water, a vigorous reaction takes place and the metal gradually disappears to form a white suspension.
(i) Write down the equation for the reaction.
(ii) Why does the solution become milky?
(iii) On filtering, a clear solution is obtained. What is the name of the clear solution?
What is the importance of heavy water with regard to nuclear power generation?
Or
Discuss the importance of heavy water in nuclear reactor.
Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes?
Long Answer TypeShort Answer TypeWhat precautions are necessary while storing hydrogen peroxide?
Or
Explain why hydrogen peroxide is stored in coloured/plastic bottles.
(i) Hydrogen peroxide cannot be stored in glass bottles since the rough surface of glass, alkali oxides present in it and exposure to light catalyse its decomposition. H2O2is stored in vessels of pure aluminium or in stone jars in the dark. Concentrated solutions of hydrogen peroxide are stored these days in polyethene bottles kept in refrigerators.
(ii) A small amount of phosphoric acid, glycerol or acetanilide must be added to retard the decomposition of H2O2. These are also called inhibitors.
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