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Question

Match the reactions given in List I with the number of electrons lost or gained in List II
ColumnIColumnIIReactionNumber of electrons lost or gained(P)Mn(OH)2+H2O2MnO2+2H2O(1)8(Q)AlCl3+3KAl+3KCl(2)2(R)3Fe+4H2OFe3O4+4H2(3)3(S)3H2S+2HNO33S+2NO+4H2O(4)6

A
PQRS2314
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B
PQRS3214
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C
PQRS2134
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D
PQRS1432
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Solution

The correct option is A PQRS2314
(P) Mn2+Mn4++2e (Oxidation)
2e+H2O22H2O (Reduction)
(Q) 3K3K++3e (Oxidation)
3e+Al3+Al (Reduction)
(R) 3FeFe3O4+8e (Oxidation)
3x=0 3x8=0
3x=8
8e+4H2O4H2 (Reduction)

(S)3H2S3S+6e (Oxidation )
2+x=0 x=0
x=2
6e+2NO32NO (Reduction)

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