CBSE Class 12 · 2016 · Delhi · d and f Block ElementsShort Answer

Complete the following chemical equations:
i) 8MnO₄⁻ + 3S₂O₃²⁻ + H₂O →
ii) Cr₂O₇²⁻ + 3Sn²⁺ + 14H⁺ →

Answer: (i) →8MnO₂+6SO₄²⁻+2OH⁻. (ii) →2Cr³⁺+3Sn⁴⁺+7H₂O.

Solution

(i)

8Mn O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8Mn O_{2} + 6S O_{4}^{2 -} + 2O H^{-}

(ii) Dichromate oxidises tin(II) to tin(IV):

C r_{2} O_{7}^{2 -} + 3S n^{2 +} + 14 H^{+} \to 2C r^{3 +} + 3S n^{4 +} + 7 H_{2} O

CBSE Class 12 Board · 2016 · Delhi · Subjective