CBSE 2025 · Region 1 · Set 1 · Q27 · 3 marks
(a)"Displacement reactions also play a key role in extracting metals in the middle of the reactivity series." Justify this statement with two examples.(b)Why can metals high up in the reactivity series not be obtained by reduction of their oxides by carbon ?
(a)
"Displacement reactions also play a key role in extracting metals in the middle of the reactivity series." Justify this statement with two examples.
(b)
Why can metals high up in the reactivity series not be obtained by reduction of their oxides by carbon ?
Marking-scheme solution
(a)
\[\begin{aligned}
3 \mathrm{MnO}_{2}(s)+4 \mathrm{Al}(s) & \longrightarrow 3 \mathrm{Mn}(l)+2 \mathrm{Al}_{2} \mathrm{O}_{3}(s)+\text { heat } \\
\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+2 \mathrm{Al}(s) & \longrightarrow 2 \mathrm{Fe}(l)+\mathrm{Al}_{2} \mathrm{O}_{3}(s)+\text { heat }
\end{aligned}
\]
(b)
Metals towards the top of the reactivity series (Na, Mg, Ca) have more affinity for oxygen than carbon.
Metals and Non-metalsThe Reactivity SeriesApplyshort_answermedium
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