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.
Explain why hydrogen peroxide cannot be stored for prolonged periods.
Hydrogen peroxide contains the weak peroxide (– O – O –) linkage. As a result, it is an unstable compound and decomposes easily into water and oxygen.
This process is further catalysed by the traces of metal impurities (Pt, Ag, Co, Fe, Cu, MnO2 etc.), dust particles, strong bases, rough surfaces and exposure to light. Thus, it cannot be stored for prolonged periods.
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