Redox and Equivalent ConceptHard

Question

The specific heat of a metal is 0.26. The chloride of the metal (always monomer) has its molecular mass 95. The volume of hydrogen gas that 1.2 g of the metal will evolve at 0o C and 1 atm, if it is allowed to react with excess of an acid, is

Options

A.2.24 L
B.1.12 L
C.0.56 L
D.5.611 L

Solution

Approximate atomic mass of metal =$\frac{6.4}{0.26} = 24.62$

Let the metal chloride be MClV.

$24.62 + V \times 35.5 \approx 95 \Rightarrow V = 2$

∴ Exact atomic mass of metal = 95 – 2 × 35.5 = 24

Now, neq metal = neq H2

Or $\frac{1.2}{24} \times 2 = \frac{V_{H_{2}}}{22.4\text{ L}} \times 2 \Rightarrow V_{H_{2}} = 1.12\text{ L}$

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