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Science · 2025 · 3 marks
CBSE 2025 · Region 3 · Set 1 · Q27
(a) What is a reactivity series of elements? How is it developed? Arrange the following elements as they are arranged in the reactivity series:…
(a)
What is a reactivity series of elements ? How is it developed ? Arrange the following elements as they are arranged in the reactivity series : Aluminum, Calcium, Copper, Lead
(b)
Write balanced chemical equation to show the reaction of iron (III) oxide $\displaystyle \left(\mathrm{Fe}_{2} \mathrm{O}_{3}\right)$ with aluminium.
Marking-scheme solution
(a) • A series of metals arranged in the order of their decreasing reactivity/ activity.
By performing displacement reactions
Calcium, Aluminium, Lead, Copper
(b) \(\displaystyle \mathrm{Fe}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Fe}+\) Heat
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.