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?
How is heavy water prepared from neutral water?
Heavy water is the oxide of deuterium (D2O) and is formed from ordinary water by exhaustive electrolysis of water containing 3% NaOH. As a result of repeated electrolysis of ordinary water, protium is liberated at the cathode in preference to deuterium. Consequently, the concentration of heavy water in ordinary water increases. Actually, electrolysis is carried out in different stages. The gases obtained from each stage are separately burnt and water thus formed is returned to the previous stage. At the end of the seventh stage, 99% D2O is obtained. This is subjected to careful fractional distillation. 100% heavy water is obtained.
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.
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