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Give a reason for the following: salts are coloured whereas salts are colourless. [Given: Atomic…
(i)(a)[1.0]
Give a reason for the following:
$\text{Ti}^{3+}$ salts are coloured whereas $\text{Ti}^{4+}$ salts are colourless.
[Given: Atomic number of $\text{Ti} = 22$]
(i)(b)[1.0]
Give a reason for the following:
Transition elements form alloys.
(i)(c)[1.0]
Give a reason for the following:
The pink coloured $\text{KMnO}_4$ solution turns colourless when reacted with Mohr’s salt ($\text{Fe}^{2+}$) in acidic medium.
(ii)(a)[1.0]
Complete and balance the following reaction:
$\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{H}_2\text{C}_2\text{O}_4 \longrightarrow \text{____} + \text{____} + \text{____} + \text{____}$
(ii)(b)[1.0]
Complete and balance the following reaction:
$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{H}_2\text{S} \longrightarrow \text{____} + \text{____} + \text{____} + \text{____}$
Answer
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From ISC 2025 Chemistry Paper 1, question 20.