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Science · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q26
Account for the following: (a) White silver chloride turns grey when exposed to sunlight. (b) Lead (II) nitrate on heating releases brown fumes. (c)…
Account for the following :
(a)
White silver chloride turns grey when exposed to sunlight.
(b)
Lead (II) nitrate on heating releases brown fumes.
(c)
Bags of oil and fat containing food items are flushed with nitrogen gas.
Marking-scheme solution
(a) Decomposition of silver chloride (AgCl) to form silver (Ag)
\[/ 2 \mathrm{AgCl}(\mathrm{~s}) \xrightarrow{\text { Sunlight }} 2 \mathrm{Ag}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g})
\]
(b) Decomposition of lead nitrate releases \(\displaystyle \mathrm{NO}_{2}\) / Nitrogen dioxide
(c) To prevent the oxidation of fats in food items.
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