Which of the following reactions is/ are not intermolecular redox reaction?

P b O_{2} + H_{2} O \to P b O + H_{2} O_{2}

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2 K C l O_{3} \to 2 K C l + 3 O_{2}

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(N H_{4})_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O

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N H_{4} N O_{2} \to N_{2} + 2 H_{2} O

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Solution

The correct options are
B $(N H_{4})_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
C $2 K C l O_{3} \to 2 K C l + 3 O_{2}$
D $N H_{4} N O_{2} \to N_{2} + 2 H_{2} O$
(i) Inter molecular Redox:In such redox reactions, one molecule of reactant is oxidized whereas molecule of other reactant is reduced.
$N O_{3}^{-} + H_{2} S + H_{2} O + H^{+} \to N H_{4}^{+} + H S O_{4}^{-}$
$N O_{3}^{-} \to N H_{4}^{+}$ (this is oxidized)
$H_{2} S \to H S O_{4}^{-}$ ( this is reduced)
(2) Intra molecular Redox:
One atom of a molecule is oxidized and other atom of same molecule is reduced then it is intramolecular redox reaction.
$2 M n_{2} O_{7} \to 4 M n O_{2} + 3 O_{2}$
So options B,C & D are intramolecular reactions only option A is inter molecular reaction.
Hence options B,C & D are correct.

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Similar questions

I : {({N H}_{4})}_{2} {C r}_{2} O_{7} ⟶ N_{2} + {C r}_{2} O_{3} + H_{2} O

I I : {N H}_{4} {N O}_{3} ⟶ N_{2} O + 2 H_{2} O

I I I : 2 K C l O_{3} ⟶ 2 K C l + 3 O_{2}

(N H_{4})_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O

{(N H_{4})}_{2} C r_{2} O_{7} ⟶ N_{2} + C r_{2} O_{3} + 2 H_{2} O

(N H_{4})_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O

(N H_{4})_{2} C r_{2} O_{7} \to N_{2} + C r_{2} O_{3} + 4 H_{2} O

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