MEDIUMMCQ SINGLEJEE Advanced ChemistryPhysical ChemistryRedox Reactions/Volumetric AnalysisConcept of Oxidation and Reduction
Match the reactions given in column I with the number of electrons lost or gained in column II Column – 1 Column – 2 Reaction Number of electrons lost or gained a. Mn OH H O MnO → p. b. AlCl 3K Al 3KCl → q. c. 3Fe 4H O Fe O 4H → r. d. H S NO S NO → s.
A.a – q ; b – r ; c – p ; d – s✓ Correct
B.a – q ; b – p ; c – r ; d – s
C.a – r ; b – q ; c – r ; d – s
D.a – p ; b – p ; c – r ; d – s
Explanation
(a – q) 2 4 Mn Mn 2e → (Oxidation) 2 2 2 2e H O 2H O → (Reduction) (b – r) 0 3K 3K 3e → (Oxidation) 3 3e Al Al → (Reduction) (c – p) 0 3 4 3Fe Fe O 8e → (Oxidation) 3x 0 3x 8 0 3x 8 2 2 8e 4H O 4H → (Reduction) 8x 8 0 8x 0 8x 8 (d – s) 2 3 3H S 3S 6e 2 x 0 x 0 x 2 6e 2NO 2NO x 6 1 x 2 0 x 5 x 2 → →
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