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Give a reason for each of the following: (a) The purple colour of disappears in the presence of…
(i)[3.0]
Give a reason for each of the following:
(a) The purple colour of $\text{KMnO}_4$ disappears in the presence of acidified solution of oxalic acid.
(b) Some transition metals and their compounds get attracted towards the magnetic field.
(c) Why are $\text{Mn}^{2+}$ compounds more stable than $\text{Fe}^{2+}$ towards oxidation to the +3 state? (atomic no. of $\text{Mn} = 25$ and $\text{Fe} = 26$)
(ii)[2.0]
Complete and balance the following reactions:
(a) $\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \longrightarrow \text{____} + \text{____} + \text{____} + \text{____}$
(b) $\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{KI} \longrightarrow \text{____} + \text{____} + \text{____} + \text{____}$
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From ISC 2025 Specimen Chemistry Paper 1, question 20.