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Chemistry · 2024 · 2 marks
The d-and f-Block ElementsSome Important Compounds of Transition Elements2 marksApplyvery short answer
CBSE 2024 · Region 3 · Set 3 · Q20
Complete and balance the following chemical equations: (a) 3 MnO_4^2-+4 H^+ → (b) Cr_2 O_7^2-+14 H^++6 Fe^2+ →
Complete and balance the following chemical equations :
(a)
$\displaystyle 3 \mathrm{MnO}_{4}^{2-}+4 \mathrm{H}^{+} \longrightarrow$
(b)
$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \longrightarrow$
Marking-scheme solution
(a)
\[3 \mathrm{MnO}_{4}{ }^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_{4}{ }^{-}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}
\]
(b)
\[\mathrm{Cr}_{2} \mathrm{O}_{7}{ }^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \longrightarrow 2 \mathrm{Cr}^{3+}+6 \mathrm{Fe}^{3+}+7 \mathrm{H}_{2} \mathrm{O}
\]
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CBSE Class 12 Chemistry past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.