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Science · 2026 · 3 marks
CBSE 2026 · Region 1 · Set 3 · Q26
What happens when :(a)An iron nail is dipped in copper (II) sulphate solution ?(b)Potassium iodide solution is mixed with lead nitrate solution ?(c)Silver chloride is exposed to sunlight ? Write balanced chemical equations to support your answer.
What happens when :
(a)
An iron nail is dipped in copper (II) sulphate solution ?
(b)
Potassium iodide solution is mixed with lead nitrate solution ?
(c)
Silver chloride is exposed to sunlight ? Write balanced chemical equations to support your answer.
Marking-scheme solution
(a) Blue colour of copper sulphate solution changes to pale green
\[\mathrm{Fe}(\mathrm{~s})+\mathrm{CuSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{~s})
\]
(b) Yellow precipitate is formed.
\[\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{KI}(\mathrm{aq}) \rightarrow \mathrm{PbI}_{2}(\mathrm{~s})+2 \mathrm{KNO}_{3}(\mathrm{aq})
\]
(c) White colour of silver chloride changes to grey.
\[2 \mathrm{AgCl} \xrightarrow{\text { sunlight }} 2 \mathrm{Ag}+\mathrm{Cl}_{2}
\]
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.