Observation I:
Number of moles of carbon containing product obtained when 10 moles of oxalate ion is oxidized by 4 moles of permanganate ion in acidic medium is ‘a’.
Observation II:
Number of moles of manganese containing product obtained when 6 moles of thiosulphate ion is oxidized by 16 moles of permanganate ion in faintly alkaline solution is ‘b’.
Then the value of $(a + b)$ is ____

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answer is 36.

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Detailed Solution

Key:36 Hint: $5 C_{2} O_{4}^{2 -} + 2 M n O_{4}^{-} + 16 H^{+} \to 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}$

$8 M n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 M n O_{2} + 6 S O_{4}^{2 -} + 2 {(O H)}^{-}$

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