Explanation
Heavy water is called as such because it is an oxide of heavy hydrogen (deuterium).
Chlorides and sulphates of Ca and Mg cause permanent hardness to water.
Absorption of H2 by Pt is called occlusion
On increasing pressure, coordination number of ions in solids increases thus thereby increasing their m.p. but in ice, pressure does not increase the C.N. of oxygen and m.p. does not increase but decreases under pressure.
N3H (hydrazoic acid) is the acidic hydride of nitrogen.
D2O is heavy water
None of the oxides is a peroxide
Colloidal solution of Pd adsorbs large volume of H2 gas.
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