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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…
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 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.