If \( \alpha \) is the degree of ionization, \( C \) the concentration of a weak electrolyte and...

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If \( \alpha \) is the degree of ionization, \( C \) the concentration of a weak electrolyte and \( K_{a} \) the acid ionization constant, then the correct relationship between \( \alpha, C \) and \( K_{a} \) is:
[Punjab PMT 1998; PMT (Raj.) 2002]
(a) \( \alpha^{2}=\sqrt{\frac{K_{a}}{C}} \)
(b) \( \alpha^{2}=\sqrt{\frac{C}{K_{a}}} \)
(c) \( \alpha=\sqrt{\frac{K_{a}}{C}} \)
(d) \( \alpha=\sqrt{\frac{C}{K_{a}}} \)
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