\[ \mathrm{KBr}+\mathrm{MnO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \text { (conc.) } \longrightarro...
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\mathrm{KBr}+\mathrm{MnO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \text { (conc.) } \longrightarrow \mathrm{KHSO}_{4}+\mathrm{MnSO}_{4}+\mathrm{H}_{2} \mathrm{O}+[\mathrm{X} \text { ] (unbalanced equation) - }
\]
(A) X turns starch paper orange red
(B) \( \mathrm{X} \) with \( \mathrm{AgNO}_{3} \) solution gives a pale yellow ppt which is completely soluble in excess ammonium hydroxide
(C) \( \mathrm{X} \) produces violet colour in organic layer in \( \mathrm{Kl} \) solution
(D) \( \mathrm{X} \) is liberated when a mixture of \( \mathrm{KBr}, \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) and conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is heated
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