An incorrect statement among the following regarding hydrogen is:
 

1.	Hydrogen never acts as a cation in ionic salts.
2.	Hydronium ion, H3O+ exists freely in a solution.
3.	Dihydrogen does not act as a reducing agent.
4.	Hydrogen has three isotopes of which protium is the most common.

The ease of adsorption of the hydrated alkali metal ions on ion-exchange resins follows the order:

1. $L{i}^{+}<K^{+}<N{a}^{+}<R{b}^{+}$

2. $R{b}^{+}<K^{+}<N{a}^{+}<L{i}^{+}$

3. $K^{+}<N{a}^{+}<R{b}^{+}<L{i}^{+}$

4. $N{a}^{+}<L{i}^{+}<K^{+}<R{b}^{+}$

The method used to remove the temporary hardness of water is-

1. Synthetic resins method

2. Calgon's method

3. Clark's method

4. Ion-exchange method

The dipole moment of ${\mathrm{H}}_2{\mathrm{O}}_2$ is more than that of ${\mathrm{H}}_2\mathrm{O}$ but ${\mathrm{H}}_2{\mathrm{O}}_2$ is not a good solvent because :

1. It has a very high dielectric constant so that ionic compounds cannot be dissolved in it.

2. It does not act as an oxidising agent

3. It acts as a reducing agent

4. It dissociates easily and acts as an oxidising agent in chemical reactions 

Of the two solvents $H_{2}O and D_{2}O$, NaCl dissolves:

(1) equally in both

(2) only in $H_{2}O$

(3) more in $D_{2}O$

(4) more in $H_{2}O$

Heavy water is ......% heavier than ordinary water

1. 11

2. 20

3. 25

4. 15

The decomposition of $H_2{O}_2$ can be slowed down by the addition of small amount of phosphoric acid which act as:

(1) stopper

(2) detainer

(3) inhibitor 

(4) promoter

The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. The hydrogen peroxide:

(1) is added to dilute the solution of the dye

(2) oxidizes the dye to give the desired color

(3) reduces the dye to give the desired color

(4) acidifies the solution of the dye

Benzene is oxidised by $H_2{O}_2$ in the presence of $FeS{O}_4$ to:

1. phenol

2. cyclohexane

3. benzaldehyde

4. benzoic acid

The rubber foam is produced by passing oxygen through rubber foaming material. This oxygen is released from:

(1) nitric oxide

(2) hydrogen peroxide

(3) Water 

(4) $C{O}_2$