A solid mixture of \( \mathrm{AgCl} \) and \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) i...

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A solid mixture of \( \mathrm{AgCl} \) and \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is heated with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and produces:
(a) greenish yellow gas
(b) colourless gas
(c) red coloured gas
(d) no gas
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