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Chemistry · 2025 · 2 marks
The d-and f-Block ElementsSome Important Compounds of Transition Elements2 marksApplyvery short answer
CBSE 2025 · Region 1 · Set 1 · Q18
Complete and balance the following chemical equations: (a) 2 MnO_4^-( aq )+10 I^-( aq )+16 H^+( aq ) → (b) Cr_2 O_7^2-( aq )+6 Fe^2+( aq )+14 H^+( aq…
Complete and balance the following chemical equations :
(a)
$\displaystyle 2 \mathrm{MnO}_{4}^{-}(\mathrm{aq})+10 \mathrm{I}^{-}(\mathrm{aq})+16 \mathrm{H}^{+}(\mathrm{aq}) \longrightarrow$
(b)
$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+6 \mathrm{Fe}^{2+}(\mathrm{aq})+14 \mathrm{H}^{+}(\mathrm{aq}) \longrightarrow$
Marking-scheme solution
(a)
$\displaystyle 10\mathrm{I}^{-} + 2\mathrm{MnO}_{4}^{-} + 16\mathrm{H}^{+} \rightarrow 2\mathrm{Mn}^{2+} + 8\mathrm{H}_{2}\mathrm{O} + 5\mathrm{I}_{2}$
(b)
$\displaystyle \mathrm{Cr}_{2}\mathrm{O}_{7}^{2-} + 14\,\mathrm{H}^{+} + 6\,\mathrm{Fe}^{2+} \rightarrow 2\,\mathrm{Cr}^{3+} + 6\,\mathrm{Fe}^{3+} + 7\,\mathrm{H}_{2}\mathrm{O}$
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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.