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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 1 · Q27
(a) Identify the reducing agent in the following reactions: (i) 4 NH_3+5 O_2 → 4 NO +6 H_2 O (ii) H_2 O + F_2 → HF + HOF (iii) Fe_2 O_3+3 CO → 2 Fe…
(a)
Identify the reducing agent in the following reactions :
(i)
$\displaystyle 4 \mathrm{NH}_{3}+5 \mathrm{O}_{2} \rightarrow 4 \mathrm{NO}+6 \mathrm{H}_{2} \mathrm{O}$
(ii)
$\displaystyle \mathrm{H}_{2} \mathrm{O}+\mathrm{F}_{2} \rightarrow \mathrm{HF}+\mathrm{HOF}$
(iii)
$\displaystyle \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \rightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}$
(iv)
$\displaystyle 2 \mathrm{H}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}$
(b)
Define a redox reaction in terms of gain or loss of oxygen.
Marking-scheme solution
(a) (i) \(\displaystyle \mathrm{NH}_{3}\)
(ii) \(\displaystyle \mathrm{H}_{2} \mathrm{O}\)
(iii) CO
(iv) \(\displaystyle \mathrm{H}_{2}\)
((b) A reaction in which the gain or loss of oxygen takes place simultaneously is called a redox reaction.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.