\( \mathrm{HBr} \) and \( \mathrm{HI} \) can reduce sulphuric acid, \( \mathrm{HCl} \) can reduc....

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\( \mathrm{HBr} \) and \( \mathrm{HI} \) can reduce sulphuric acid, \( \mathrm{HCl} \) can
\( \mathrm{P} \)
reduce \( \mathrm{KMnO}_{4} \) and \( \mathrm{HF} \) can reduce:
(1) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
(2) \( \mathrm{KMnO}_{4} \)
(3) \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(4) None of these


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