Correct statement(s) is/are (a) An acidified solution of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \math...

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Correct statement(s) is/are
(a) An acidified solution of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) liberates iodine from KI.
(b) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is used as a standard solution for estimation of \( \mathrm{Fe}^{2+} \) ions.
(c) In acidic medium, \( \mathrm{M}=\mathrm{N} / 6 \) for \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \).
(d) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) on heating decomposes to yield \( \mathrm{Cr}_{2} \mathrm{O}_{3} \) through an endothermic reaction.
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