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Science · 2023 · 3 marks
CBSE 2023 · Region 2 · Set 3 · Q27
(a) Define oxidation. (b) Identify the oxidising agent in the following reactions and balance the chemical equations: (i) Pb_3 O_4+ HCl → PbCl_2+…
(a)
Define oxidation.
(b)
Identify the oxidising agent in the following reactions and balance the chemical equations :
(i)
$\displaystyle \mathrm{Pb}_{3} \mathrm{O}_{4}+\mathrm{HCl} \longrightarrow \mathrm{PbCl}_{2}+\mathrm{Cl}_{2}+\mathrm{H}_{2} \mathrm{O}$
(ii)
$\displaystyle \mathrm{MnO}_{2}+\mathrm{Al} \longrightarrow \mathrm{Mn}+\mathrm{Al}_{2} \mathrm{O}_{3}$
Marking-scheme solution
(a) Gain of oxygen or loss of hydrogen.
(b) (i) \(\displaystyle \mathrm{Pb}_{3} \mathrm{O}_{4}\)
\[\mathrm{Pb}_{3} \mathrm{O}_{4}+8 \mathrm{HCl} \longrightarrow 3 \mathrm{PbCl}_{2}+\mathrm{Cl}_{2}+4 \mathrm{H}_{2} \mathrm{O}
\]
(ii) \(\displaystyle \mathrm{MnO}_{2}\)
\[3 \mathrm{MnO}_{2}+4 \mathrm{Al} \longrightarrow 3 \mathrm{Mn}+2 \mathrm{Al}_{2} \mathrm{O}_{3}
\]
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