Hydrogen peroxide is obtained by the electrolysis of ______.

1.  water

2.  sulphuric acid

3.  hydrochloric acid

4.  fused sodium peroxide

Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

1.  ${\mathrm{CH}}_4\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{Ni}}{\overset{1270<mspace\; width="1em"></mspace>\mathrm{K}}{\to }}\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

2.  $\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{Catalyst}}{\overset{673<mspace\; width="1em"></mspace>\mathrm{K}}{\to }}{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

3.  ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}+{\mathrm{nH}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{Ni}}{\overset{1270<mspace\; width="1em"></mspace>\mathrm{K}}{\to }}\mathrm{nCO}+(2\mathrm{n}+1){\mathrm{H}}_2$

4.  $\mathrm{CO}\left(\mathrm{g}\right)+2{\mathrm{H}}_2\left(\mathrm{g}\right)\underset{\mathrm{Catalyst}}{\overset{\mathrm{Cobalt}}{\to }}{\mathrm{CH}}_3\mathrm{OH}\left(\mathrm{l}\right)$

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

1. Ca²⁺

2.  Na⁺

3.  Cl^-

4.  K⁺

A water softening reagent among the following is -

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

The group that has hydride formed by only one member is -

1.  6

2.  7

3.  8

4.  9

Which of the following statements are not true for hydrogen?

Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Dihydrogen can be prepared on a commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H₂ gas is formed. It is known as _____.

a.  Water gas

b.  Syngas

c.  Producer gas

d.  Industrial gas

Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Which of the following statement(s) is/are correct in the case of heavy water?

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Which of the following statements about hydrogen are correct?

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)