A mixture upon adding conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives deep red fumes. Mixture m...

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A mixture upon adding conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives deep red fumes. Mixture may contain the anions pair:
(a) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) and \( \mathrm{Cl}^{-} \)
(b) \( \mathrm{Br}^{-} \)and \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
(c) \( \mathrm{NO}_{3}^{-} \)and \( \mathrm{Cl}^{-} \)
(d) \( \mathrm{CrO}_{4}^{2-} \) and \( \mathrm{NO}_{3}^{2-} \)
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