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Question

Deutero methane is obtained by the deuterolysis of :

A
Mg3N2
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B
CaC2
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C
Al4C3
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D
Ca3P2
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Solution

The correct option is C Al4C3
Nitrides and phosphides does not yield methane on treatment with water.
CaC2 yields acetylene on reacting with water, hence they are called acetylides.
When Al4C3 and Be2C are treated with H2O they produce CH4. Hence these carbides are called methanides. Similary if we use D2O in the place of H2O, it will yield Deutero methane.



Heavy water D2O deuterium oxide:

Constant H2O D2O

Molecular mass 18.015 20.028

Maximum density(g cm3) 1.000 1.106

Melting point(K) 273.2 276.8

Boiling point(K) 373.2 374.4

heat of fusion (kJ mol^{-1}) at 273 K 6.01

heat of vapourization (kJ mol^{-1}) at 373 K 40.66 41.61

heat of formation (kJ mol^{-1}) at 273 K 285.9 294.6

Ionization constant 1.008×1014 1.95×1015

Important uses of heavy water:

1. Moderator and coolant in nuclear reactors

2. In the study of mechanism of chemical reactions

3. Starting material for the preparation of a number of deuterium compounds

Hard and soft water:

Water which produces lather with soap solution readily is called soft water.

E.g. Distilled water, rain water and demineralised water

Water which does not produce lather with soap solution readily is called hard water.

E.g. Sea water, river water, well water and tap water


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