Consider the reactions

$\left(\mathrm{A}\right) H_2{O}_2 + 2HI \to {\mathrm{I}}_2+2{\mathrm{H}}_2\mathrm{O} \left(\mathrm{B}\right) \mathrm{HOCl} + {\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{H}}_3{\mathrm{O}}^{+}{\mathrm{Cl}}^{-} + {\mathrm{O}}_2$

Which of the following statements is correct about ${\mathrm{H}}_2{\mathrm{O}}_2$ with reference to these reactions? Hydrogen perioxide is ________.

1.  An oxidising agent in both (A) and (B)

2.  An oxidising agent in (A) and reducing agent in (B)

3.  A reducing agent in (A) and oxidizing agent in (B)

4.  A reducing agent in both (A) and (B)

The oxide that gives ${\mathrm{H}}_2{\mathrm{O}}_2$ on treatment with dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ is ____

1.  ${\mathrm{PbO}}_2$

2.  ${\mathrm{BaO}}_2.8{\mathrm{H}}_2\mathrm{O}$

3.  ${\mathrm{MnO}}_2$

4.  ${\mathrm{TiO}}_2$

Which of the following equations depict the oxidising nature of ${\mathrm{H}}_2{\mathrm{O}}_2$?

1.  $2{{\mathrm{MnO}}_4}^{-} + 6{\mathrm{H}}^{+} + 5{\mathrm{H}}_2{\mathrm{O}}_2 \to 2{\mathrm{Mn}}^{2+} + 8{\mathrm{H}}_2\mathrm{O} + 5{\mathrm{O}}_2$

2.  $2{\mathrm{Fe}}^{3+} + 2{\mathrm{H}}^{+} + {\mathrm{H}}_2{\mathrm{O}}_2 \to 2{\mathrm{Fe}}^{2+} + 2{\mathrm{H}}_2\mathrm{O} + {\mathrm{O}}_2$

3.  $2{\mathrm{I}}^{-} + 2{\mathrm{H}}^{+}+ {\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{I}}_2+2{\mathrm{H}}_2\mathrm{O}$

4.  ${\mathrm{KIO}}_4 + {\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{KIO}}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

Which of the following equation depicts reducing nature of ${\mathrm{H}}_2{\mathrm{O}}_2$?

1.  $2{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-} + 2{\mathrm{H}}^{+}+{\mathrm{H}}_2{\mathrm{O}}_2 \to 2{\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{3-} + 2{\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{I}}_2+{\mathrm{H}}_2{\mathrm{O}}_2+2{\mathrm{OH}}^{-} \to 2{\mathrm{I}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

3.  ${\mathrm{Mn}}^{2+}+{\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{Mn}}^{4+}+2{\mathrm{OH}}^{-}$

4.  $\mathrm{PbS} + 4{\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{PbSO}}_4 + 4{\mathrm{H}}_2\mathrm{O}$

Hydrogen peroxide is-.

1.  An oxidising agent

2.  A reducing agent

3.  Both an oxidising and a reducing agent

4.  Neither oxidising nor reducing agent

When sodium peroxide is treated with dilute sulphuric acid, we get ______.

1.  Sodium sulphate and water

2.  Sodium sulphate and oxygen

3.  Sodium sulphate, hydrogen and oxygen

4.  Sodium sulphate and hydrogen peroxide

Hydrogen peroxide is obtained by the electrolysis of ______.

1.  Water

2.  Sulphuric acid

3.  Hydrochloric acid

4.  Fused sodium peroxide

Which of the following ions will cause hardness in water sample?

1.  ${\mathrm{Ca}}^{2+}$

2.  ${\mathrm{Na}}^{+}$

3.  $C{l}^{-}$

4.  $K^{+}$

Which of the following compounds is used for water softening?

1.  ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2$

2.  ${\mathrm{Na}}_3{\mathrm{PO}}_4$

3.  ${\mathrm{Na}}_6{\mathrm{P}}_6{\mathrm{O}}_{18}$

4.  ${\mathrm{Na}}_2{\mathrm{HPO}}_4$

Elements of which of the following group(s) of periodic table do not form hydrides.

1.  Groups 7, 8, 9

2.  Group 13

3.  Groups 15, 16, 17

4.  Group 14