Which of the following is/are soluble in excess of \( \mathrm{NaOH} \) ? (a) \( \mathrm{Al}(\mat...

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Which of the following is/are soluble in excess of \( \mathrm{NaOH} \) ?
(a) \( \mathrm{Al}(\mathrm{OH})_{3} \)
(b) \( \mathrm{Cr}(\mathrm{OH})_{3} \)
(c) \( \mathrm{Fe}(\mathrm{OH})_{3} \)
(d) \( \mathrm{Zn}(\mathrm{OH})_{2} \)
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