Which of the following reactions is/are intramolecular redox reaction(s)?

2 {M n}_{2} O_{7} ⟶ 4 M n O_{2} + 3 O_{2}

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K_{3} [F e {(C N)}_{6}] + 30 H_{2} O ⟶ {F e}^{3 +} + 6 C O_{2} + 6 N O_{3}^{⊖} + 60 H^{\oplus} + 60 e^{-}

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2 H g O ⟶ 2 H g + O_{2}

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P h C H O N a O H - -------- \to P h C H_{2} O H + P h C O O N a

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Solution

The correct options are
B $2 {M n}_{2} O_{7} ⟶ 4 M n O_{2} + 3 O_{2}$
C $2 H g O ⟶ 2 H g + O_{2}$
In option A, Mn is reduced and oxygen is oxidised.
In option C, Hg is reduced and oxygen is oxidised.
Hence, options A & C are correct.

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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}

2 H g O \to 2 H g + O_{2}

2 H g O (s) Δ - \to 2 H g (s) + O_{2} (g)

4 F e + 3 O_{2} \to 4 F e^{3 +} + 6 O^{2 -}

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