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Science · 2023 · 3 marks
CBSE 2023 · Region 6 · Set 3 · Q33
State the change in colour observed in each of the following cases mentioning the reason :(a)Silver chloride is exposed to sunlight.(b)A piece of zinc is dipped in ferrous sulphate solution.(c)Copper powder is strongly heated in air.
State the change in colour observed in each of the following cases mentioning the reason :
(a)
Silver chloride is exposed to sunlight.
(b)
A piece of zinc is dipped in ferrous sulphate solution.
(c)
Copper powder is strongly heated in air.
Marking-scheme solution
(a)
white to grey due to formation of Ag
(b)
\(\displaystyle \mathrm{ZnSO}_{4}\) is formed which is colourless
change in color - Pale green \(\displaystyle \left(\mathrm{FeSO}_{4}\right)\) to colourless \(\displaystyle \left(\mathrm{ZnSO}_{4}\right)\)
(c)
Copper (Brown) oxidises to copper (II) oxide (Black)
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.