CBSE 2023 · Region 1 · Set 1 · Q21 · 2 marks
Complete the following equations:(a)$\displaystyle 2 \mathrm{MnO}_{4}^{-}+5 \mathrm{NO}_{2}^{-}+6 \mathrm{H}^{+} \longrightarrow$(b)$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \longrightarrow$
Complete the following equations:
(a)
$\displaystyle 2 \mathrm{MnO}_{4}^{-}+5 \mathrm{NO}_{2}^{-}+6 \mathrm{H}^{+} \longrightarrow$
(b)
$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \longrightarrow$
Marking-scheme solution
(a) \(\displaystyle \mathbf{2 ~ M n}_{\mathbf{4}}^{-}+\mathbf{5} \mathbf{N O}_{\mathbf{2}}^{-}+\mathbf{6 ~ H}^{+} \longrightarrow \mathbf{2} \mathbf{M n}^{\mathbf{2}+}+\mathbf{5} \mathbf{N O}_{\mathbf{3}}^{-}+\mathbf{3 ~ H}_{\mathbf{2}} \mathbf{O}\)
(b) \(\displaystyle \mathbf{C r}_{\mathbf{2}} \mathrm{O}_{7}^{2-}+\mathbf{1 4}^{+}+\mathbf{6 ~ e}^{-} \longrightarrow \mathbf{2 C r}^{\mathbf{3}+}+\mathbf{7 H}_{\mathbf{2}} \mathbf{O}\)
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.