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Science · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 2 · Q26
Answer the following :(a)Identify the substance oxidized and the substance reduced in the following reaction : \[4 \mathrm{Na}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{Na}_{2} \mathrm{O} \](b)What type of reaction occurs when Lead (II) nitrate solution is mixed with potassium iodide solution ?(c)Why is silver chloride stored in dark coloured bottles ?
Answer the following :
(a)
Identify the substance oxidized and the substance reduced in the following reaction : \[4 \mathrm{Na}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{Na}_{2} \mathrm{O} \]
(b)
What type of reaction occurs when Lead (II) nitrate solution is mixed with potassium iodide solution ?
(c)
Why is silver chloride stored in dark coloured bottles ?
Marking-scheme solution
Substance oxidised = Na
Substance reduced = \(\displaystyle \mathrm{O}_{2}\)
(b) Double displacement/Precipitation reaction
(c) Silver chloride decomposes into silver and chlorine by sunlight.
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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.