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Science · 2025 · 2 marks
CBSE 2025 · Region 6 · Set 3 · Q21
Name a metal found in the earth's crust (i) in free state and (ii) in the form of its compound. State where each of these metals are placed in the…
Name a metal found in the earth's crust
(i)
in free state and
(ii)
in the form of its compound. State where each of these metals are placed in the reactivity series of metals.
Marking-scheme solution
(i)
Copper / Silver / Gold / Platinum
At the bottom of reactivity series of metals.
(ii)
Sodium / Potassium / Calcium / Magnesium / Aluminium
At the top of reactivity series of metals
/Zinc / Iron / Lead / Copper
At the middle of activity series.
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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.