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Acidified potassium dichromate can not oxidise :

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a

${FeCl}_{3}$

b

${FeCl}_{2}$

c

$H_{2} S$

d

All the above

answer is A.

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Detailed Solution

Oxidation state of Fe in FeCl₃ is +3, as Fe is already in its highest oxidation state. Therefore, it cannot further oxidized. Whereas in FeCl₂, Fe has +2 oxidation state and can oxidize further upto +3 oxidation state. Oxidation state of S in H₂S is -2 and its highest oxidation state of S is +6. Therefore, it can oxidize with acidified potassium dichromate.

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