The ionisation energy of hydrogen is high as compared to alkali metals because of

1. One electron in outermost shell

2. Small size

3. One proton in its nucleus

4. No Neutron

High purity dihydrogen is obtained by

1. Warm aqueous barium hydroxide

2. Brine solution

3. Acidified sulphate solution

4. Water gas

Hardness  of water  cannot  be removed by

1. Treating with washing soda
2. Boiling
3. Adding calgon
4. Addition of chlorine

H₂O₂ can be obtained when following reacts with H₂SO₄ except with

Which is not a polymeric/dimeric hydride?

1. ${\mathrm{BeH}}_2$

2. ${\mathrm{MgH}}_2$

3. ${\mathrm{BH}}_3$

4. $\mathrm{NaH}$

What volume of 15 $\mathrm{V} {\mathrm{H}}_2 {\mathrm{O}}_2$ required to react completely with 10 ml of 1 M ${\mathrm{KMnO}}_4$ in acidic medium?

1. 18.72 ml

2. 25.51 ml

3. 14.20 ml

4. 10.65 ml

${\mathrm{H}}_2{\mathrm{O}}_2$ functions as a 

1. Bleaching agent

2. Oxidising agent

3. Oxidant for a rocket fuel

4. All of the above

A substance on heating gives oxygen and it turns acidified KI solution violet and reduces acidified ${\mathrm{KMnO}}_4$ solution. Hence, the substance is 

1. ${\mathrm{SO}}_2$

2. ${\mathrm{K}}_2{\mathrm{CrO}}_4$

3. ${\mathrm{H}}_2{\mathrm{O}}_2$

4. All of the above

Molarity of a solution of 1 liter $H_2{O}_2$ marked as 20 volume is-

1. 1.78

2. 3.57

3. 20

4. 0.20

Incorrect statement is

1. Hybridisation of oxygen for water in solid, liquid and gas phase is $s{p}^3$

2. Density of water is more than the density of ice

3. Boiling point of HF> Boiling point of $H_{2}O,$ as electronegativity of F>O

4. All of thhe above