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Q.

Molar specific heats of some common solids at room temperature are given by 3R, where R is the molar gas constant. However, one of the following solids will NOT follow this general rule. Identify it from the options.

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a

Aluminium

b

 Silver

c

Copper   

d

Carbon

answer is C.

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Detailed Solution

In case of carbon we do not observe the same type of metallic bonds as in other three.

As in case of diamond the atoms are tightly packed so not as free to vibrate.

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Molar specific heats of some common solids at room temperature are given by 3R, where R is the molar gas constant. However, one of the following solids will NOT follow this general rule. Identify it from the options.