Which one of the following salts will have the same value of van't Hoff factor \( (i) \) as that...

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Which one of the following salts will have the same value of van't Hoff factor \( (i) \) as that of \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \).
(a) \( \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} \)
(b) \( \mathrm{NaCl} \) (c)
\( \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} \)
(d) \( \mathrm{Na}_{2} \mathrm{SO}_{4} \).
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