Redox and Equivalent ConceptHard

Question

The specific heat of a metal is found to be 0.03. 10 g of the metal on treatment with nitric acid gave 18.9 g of pure dry nitrate. The correct statement(s) is/are

Options

A.The equivalent weight of the metal is 69.66.
B.The atomic weight of the metal is 209.
C.The metal is trivalent.
D.The metal is an alkali metal.

Solution

Atomic weight (approx.) $\frac{6.4}{0.03} = 213.33$

Now, $\frac{10}{E_{M}} = \frac{18.9}{E_{M} + 62} \Rightarrow E_{M} = 69.66$

Now, Valency $\approx \frac{213.33}{69.6} \approx 3$ (Integer value)

∴ Atomic weight (exactly) = $69.66 \times 3 = 208.98$

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