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Science · 2026 · 3 marks
CBSE 2026 · Region 1 · Set 1 · Q26
(a) Name the substance oxidised and reduced in the following reaction: ZnO + C → Zn + CO (b) Balance the following chemical reaction: Pb ( NO_3)_2+…
(a)
Name the substance oxidised and reduced in the following reaction : $\displaystyle \mathrm{ZnO}+\mathrm{C} \longrightarrow \mathrm{Zn}+\mathrm{CO}$
(b)
Balance the following chemical reaction : $\displaystyle \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{KI} \longrightarrow \mathrm{PbI}_{2}+\mathrm{KNO}_{3}$
(c)
Give one example each of electrolytic decomposition and decomposition by sunlight.
Marking-scheme solution
Substance oxidised - C
Substance reduced - ZnO
(b) \(\displaystyle \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}+\mathbf{2 ~ K I} \rightarrow \mathrm{PbI}_{2}+\mathbf{2 ~ K N O}_{3}\)
\(\displaystyle 2 \mathrm{H}_{2} \mathrm{O} \xrightarrow{\text { electricity }} 2 \mathrm{H}_{2}+\mathrm{O}_{2}\)
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.