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Science · 2025 · 2 marks
Chemical Reactions and EquationsWriting and Balancing Chemical Equations2 marksApplyvery short answer
CBSE 2025 · Region 2 · Set 2 · Q21
Balance the following chemical equations: (a) CO_2+ H_2 O →[ Chlorophyll ] Sunlight C_6 H_12 O_6+ O_2+ H_2 O (b) Pb ( NO_3)_2 → Heat PbO + NO_2+ O_2
Balance the following chemical equations :
(a)
$\displaystyle \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \xrightarrow[\text { Chlorophyll }]{\text { Sunlight }} \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+\mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{O}$
(b)
$\displaystyle \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \xrightarrow{\text { Heat }} \mathrm{PbO}+\mathrm{NO}_{2}+\mathrm{O}_{2}$
Marking-scheme solution
(a) \(\displaystyle 6 \mathrm{CO}_{2}+12 \mathrm{H}_{2} \mathrm{O} \xrightarrow[\text { Chlorophyll }]{\text { Sunlight }} \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2}+6 \mathrm{H}_{2} \mathrm{O}\)
(b) \(\displaystyle 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \xrightarrow{\text { Heat }} 2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}\)
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.