6
MCQ (Single Correct Answer)
Consider the reactions
(i) $\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{HI} \longrightarrow \mathrm{I}_2+2 \mathrm{H}_2 \mathrm{O}$
(ii) $\mathrm{HOCl}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{H}_3 \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_2$
Which of the following statements is correct about $\mathrm{H}_2 \mathrm{O}_2$ with reference to these reactions? Hydrogen peroxide is ........... .
A
an oxidising agent in both (i) and (ii)
B
an oxidising agent in (i) and reducing agent in (ii)
C
a reducing agent in (i) and oxidising agent in (ii)
D
a reducing agent in both (i) and (ii)
7
MCQ (Single Correct Answer)
The oxide that gives $\mathrm{H}_2 \mathrm{O}_2$ on treatment with dilute $\mathrm{H}_2 \mathrm{SO}_4$ is
A
$\mathrm{PbO}_2$
B
$\mathrm{BaO}_2 \cdot 8 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
C
$\mathrm{MnO}_2$
D
$\mathrm{TiO}_2$
8
MCQ (Single Correct Answer)
Which of the following equations depict the oxidising nature of $\mathrm{H}_2 \mathrm{O}_2$ ?
A
$2 \mathrm{MnO}_4^{-}+6 \mathrm{H}^{+}+5 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow 2 \mathrm{Mn}^{2+}+8 \mathrm{H}_2 \mathrm{O}+5 \mathrm{O}_2$
B
$2 \mathrm{Fe}^{3+}+2 \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow 2 \mathrm{Fe}^{2+}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
C
$2 \mathrm{I}^{-}+2 \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{I}_2+2 \mathrm{H}_2 \mathrm{O}$
D
$\mathrm{KIO}_4+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{KIO}_3+\mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
9
MCQ (Single Correct Answer)
Which of the following equation depicts reducing nature of $\mathrm{H}_2 \mathrm{O}_2$ ?
A
$2\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}+2 \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow 2\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}+2 \mathrm{H}_2 \mathrm{O}$
B
$\mathrm{I}_2+\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{I}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
C
$\mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{Mn}^{4+}+2 \mathrm{OH}^{-}$
D
$\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}$
10
MCQ (Single Correct Answer)
Hydrogen peroxide is ........... .
A
an oxidising agent
B
a reducing agent
C
both an oxidising and a reducing agent
D
neither oxidising nor reducing agent