Which of the statements is not true? P (1) On passing \( \mathrm{H}...

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