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Which of the statements is not true?
(a) On passing \( \mathrm{H}_{2} \mathrm{~S} \) through acidified \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution, a milky colour is observed.
(b) \( \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is preferred over \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) in volumetric analysis.
(c) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution in acidic medium is orange.
(d) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution becomes yellow on increasing the \( \mathrm{pH} \) beyond 7 .
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