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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q24
Complete and balance the following chemical equations: 3 × 1 (a) MnO_4^-+ C_2 O_4^2-+ H^+ → (b) KMnO_4 →[513 K ] Heat (c) Cr_2 O_7^2-+ H_2 S + H^+ →
Complete and balance the following chemical equations : $\displaystyle \mathbf{3} \boldsymbol{\times} \mathbf{1}$
(a)
$\displaystyle \mathrm{MnO}_{4}^{-}+\mathrm{C}_{2} \mathrm{O}_{4}^{2-}+\mathrm{H}^{+} \longrightarrow$
(b)
$\displaystyle \mathrm{KMnO}_{4} \xrightarrow[513 \mathrm{~K}]{\text { Heat }}$
(c)
$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{H}_{2} \mathrm{~S}+\mathrm{H}^{+} \longrightarrow$
Marking-scheme solution
(a)
\[5\mathrm{C_2O_4^{2-}} + 2\mathrm{MnO_4^{-}} + 16\mathrm{H^{+}} \longrightarrow 2\mathrm{Mn^{2+}} + 8\mathrm{H_2O} + 10\mathrm{CO_2}\]
(b)
\[2\mathrm{KMnO_4} \rightarrow \mathrm{K_2MnO_4} + \mathrm{MnO_2} + \mathrm{O_2}\]
(c)
\[\mathrm{Cr_2O_7^{2-}} + 8\mathrm{H^{+}} + 3\,\mathrm{H_2S} \rightarrow 2\mathrm{Cr^{3+}} + 3\mathrm{S} + 7\mathrm{H_2O}\]
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.