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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 2 · Q25
Answer the following :(a)Why should chemical equations be balanced ?(b)Name the oxidising and reducing agent in the following equation : $\displaystyle 4 \mathrm{Na}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{Na}_{2} \mathrm{O}$
Answer the following :
(a)
Why should chemical equations be balanced ?
(b)
Name the oxidising and reducing agent in the following equation : $\displaystyle 4 \mathrm{Na}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{Na}_{2} \mathrm{O}$
Marking-scheme solution
(a) To follow the law of conservation of mass
(b) Oxidising agent - \(\displaystyle \mathrm{O}_{2}\) /Oxygen Reducing agent - Na/ Sodium
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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.