Which of the following solid salt on heating with P \( \mathrm{K}_{...

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Which of the following solid salt on heating with
P \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) and Conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) orange, red vapours are

W evolved which turn aqueous \( \mathrm{NaOH} \) solution yellow?
(1) \( \mathrm{NaBr} \)
(2) \( \mathrm{NaCl} \)
(3) \( \mathrm{NaNO}_{3} \)
(4) \( \mathrm{Nal} \)
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