Which of the following reaction is spontaneous oxidation - reduction reaction

Which of the following reaction is spontaneous oxidation - reduction reaction
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Which of the following reaction is spontaneous oxidation - reduction reaction A. `Mn^(+2)+5Fe^(+3)+4H_(2) ... OrarrMnO_(4)^(-)+5Fe^(+3)+8H^(+)`
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Description : The working of a dry cell is based on - (1) Decomposition reaction (2) Spontaneous oxidation-reduction reaction (3) Combination reaction. (4) Electrolysis

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Asserarion:Bleaching action action of `SO_(2)` is temporary and by reduction. Reason: The colour of material is regained due to oxidation by air.

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In mammals other than higher primates uric acid is converted by (A) Oxidation to allantoin (B) Reduction to ammonia (C) Hydrolysis to ammonia (D) Hydrolysis to allantoin

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The oxidation reduction process is

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