The observed and normal molar masses of compound $$MX_2$$ are $$65.6$$ and $$164$$ respectively. The percent degree of ionisation of $$MX_2$$ is $$\underline{\hspace{2cm}}\%.$$ (Nearest integer)

Correct Answer: 75

MX₂ → M²⁺ + 2X⁻. i = 1+2α where α is degree of ionization.

i = normal mass/observed mass = 164/65.6 = 2.5.

2.5 = 1+2α. α = 0.75 = 75%.

The answer is 75.

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