CBSE 2024 · Region 3 · Set 3 · Q20 · 2 marks
Complete and balance the following chemical equations :(a)$\displaystyle 3 \mathrm{MnO}_{4}^{2-}+4 \mathrm{H}^{+} \longrightarrow$(b)$\displaystyle \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \longrightarrow$
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)
\[\mathrm{Cr}_{2} \mathrm{O}_{7}{ }^{2-}+14 \mathrm{H}^{+}+6 \mathrm{Fe}^{2+} \longrightarrow 2 \mathrm{Cr}^{3+}+6 \mathrm{Fe}^{3+}+7 \mathrm{H}_{2} \mathrm{O}
\]
The d-and f-Block ElementsSome Important Compounds of Transition ElementsApplyvery_short_answermedium
More from The d-and f-Block Elements
- (i) Silver atom has completely filled d-orbitals in its ground state, it is still considered to be a…2022 · asked 3×
- (i) Describe giving reason which one of the following pairs has the property indicated: (I) Fe or Cu - higher…2026 · asked 3×
- The diamagnetic species is:2025 · asked 3×
- Assertion: Zr and Hf are of almost similar atomic radii. Reason (R): This is due to Lanthanoid contraction.2024 · asked 3×
- (i) When pyrolusite ore is fused with KOH, in presence of air, a dark green coloured product 'A' is obtained…2025 · asked 3×
- The element having [Ar] 3 d^10 4 s^1 electronic configuration is2025 · asked 3×
- From the given E^ values of the first row transition elements, answer the following questions: (i) Why is E…2022 · asked 3×
- Account for the following: (i) Transition metals and their compounds show catalytic activities. (ii) Zn, Cd…2022 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.