Question:
KMnO\(_4\) oxidises hydrogen sulphide in acidic medium. The number of moles of KMnO\(_4\) which react with one mole of hydrogen sulphide is
KMnO\(_4\) oxidises hydrogen sulphide in acidic medium. The number of moles of KMnO\(_4\) which react with one mole of hydrogen sulphide is
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Always balance redox reactions using oxidation numbers or half-reaction method to get correct stoichiometric ratios.
Updated On: Jun 6, 2025
- \( 2 \)
- \( 4 \)
- \( 0.4 \)
- \( 2.5 \)
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The Correct Option is C
Solution and Explanation
Explanation:
In acidic medium, the redox reaction between potassium permanganate and hydrogen sulphide is:
\[ 2KMnO_4 + 5H_2S + 3H_2SO_4 \rightarrow 2MnSO_4 + 5S + 8H_2O + K_2SO_4 \]
From the balanced reaction, 2 moles of KMnO\(_4\) react with 5 moles of H\(_2\)S.
So, for 1 mole of H\(_2\)S, the required moles of KMnO\(_4\) = \( \frac{2}{5} = 0.4 \)
Final Answer:
0.4
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