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Nucleus: Common Terms

What is the v...

Question

What is the valency of an element of which the equivalent weight is 12 and the specific heat is 0.25?

A

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B

2

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C

3

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D

4

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Solution

The correct option is A 2
Specific heat $\times$ Atomic weight $= 6.4$ (Dulong and Petit law)
Atomic weight $= \frac{6.4}{specific heat} = \frac{6.4}{0.25}$
Atomic weight $= E q \times v a l e n c y = 25.6$
Valency $= \frac{Atomic weight}{E w} = \frac{25.6}{12} = 2$
(Valency is always a whole number)

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