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

Only one element of ________ forms hydride.

1. Group 6

2. Group 7

3. Group 8

4. Group 9

Match the terms in Column I with the relevant item in Column II.
              Column I                                       Column II
(1) Electrolysis of water produces                  (a) Atomic reactor
(2) Lithium aluminium hydride is used as       (b) Polar molecule
(3) Hydrogen chloride is a                             (c) Recombines on metal
                                                                       surface to generate high temperature
(4) Heavy water is used in                            (d) Reducing agent
(5) Atomic hydrogen                                    (e) Hydrogen and oxygen

1. (1)$\Rightarrow$e, (2)$\Rightarrow$d, (3)$\Rightarrow$b, (4)$\Rightarrow$a, (5)$\Rightarrow$c

2. (1)$\Rightarrow$b, (2)$\Rightarrow$c, (3)$\Rightarrow$a, (4)$\Rightarrow$d, (5)$\Rightarrow$e

3. (1)$\Rightarrow$a, (2)$\Rightarrow$d, (3)$\Rightarrow$e, (4)$\Rightarrow$b, (5)$\Rightarrow$c

4. (1)$\Rightarrow$d, (2)$\Rightarrow$c, (3)$\Rightarrow$a, (4)$\Rightarrow$b, (5)$\Rightarrow$e

Match the items in Column I with the relevant item in Column II.

1. (1) → (b), (d) (2) → (c) (3) → (a), (c)

2. (1) → (c), (d) (2) → (b) (3) → (a), (c)

3. (1) → (b), (a) (2) → (a) (3) → (d), (c)

4. (1) → (a), (c) (2) → (d) (3) → (a), (b)