Covalent hydride among the following is -

1. ${\mathrm{NH}}_3$ $\mathrm{and}$ ${\mathrm{B}}_2{\mathrm{H}}_6$

2. ${\mathrm{CaH}}_2$ $\mathrm{and}$ ${\mathrm{B}}_2{\mathrm{H}}_6$

3. $\mathrm{NaH}$ $\mathrm{and}$ ${\mathrm{CaH}}_2$

4. $\mathrm{NaH}$ $\mathrm{and}$ ${\mathrm{NH}}_3$

Reaction among the following where ${\mathrm{H}}_2{\mathrm{O}}_2$ acts as a reducing agent is-

a. ${\mathrm{H}}_2{\mathrm{O}}_2+2{\mathrm{H}}^{+}+2{\mathrm{e}}^{-}\to 2{\mathrm{H}}_2\mathrm{O}$

b. ${\mathrm{H}}_2{\mathrm{O}}_2-2{\mathrm{e}}^{-}\to {\mathrm{O}}_2+2{\mathrm{H}}^{+}$

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

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

1. a, b

2. c, d

3. a, c

4. b, d

Decolourisation of acidified potassium permanganate by ${\mathrm{H}}_2{\mathrm{O}}_2$  is due to:

1. Oxidation of ${\mathrm{KMnO}}_4$

2. Reduction of ${\mathrm{KMnO}}_4$

3. Both oxidation and reduction of ${\mathrm{KMnO}}_4$

4. None of the above.

For the bleaching of hair, the substance used is:

1. ${\mathrm{SO}}_2$

2. Bleaching powder

3. ${\mathrm{H}}_2{\mathrm{O}}_2$

4. ${\mathrm{O}}_3$

The oxidising nature of ${\mathrm{H}}_2{\mathrm{O}}_2$ is shown in the reaction-

1. ${\mathrm{H}}_2{\mathrm{O}}_2+2\mathrm{KI}\to 2\mathrm{KOH}+{\mathrm{I}}_2$

2. ${\mathrm{Cl}}_2+{\mathrm{H}}_2{\mathrm{O}}_2\to 2\mathrm{HCl}+{\mathrm{O}}_2$

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

4. $\mathrm{NaClO}+{\mathrm{H}}_2{\mathrm{O}}_2\to \mathrm{NaCl}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

The correct statement among the following regarding H₂O₂ is-

1. Two hydrogen atoms are connected to one oxygen atom.

2. All the four atoms are in the same plane.

3. The four atoms are arranged in a non-linear and non-planar manner.

4. O-H bonds are polar but the molecule is non-polar.

${\mathrm{H}}_2{\mathrm{O}}_2$ act as a reducing agent in :

1. Reaction with a ferrous salt.

2. Reaction with iodides.

3. Reaction with lead sulphide.

4. Reaction with ${\mathrm{KMnO}}_4$ in an acid medium.

The role of ${\mathrm{H}}_2{\mathrm{O}}_2$ when added to a solution containing ${\mathrm{KMnO}}_4$ $\mathrm{and}$ ${\mathrm{H}}_2{\mathrm{SO}}_4$ is of-

1. An oxidizing agent

2. A reducing agent

3. Both as an oxidizing as well as a reducing agent

4. None of the above

${\mathrm{H}}_2{\mathrm{O}}_2$ is stored in:

1. Iron container after the addition of stabilizer

2. Glass container after the addition of stabilizer

3. Plastic container after the addition of stabilizer

4. None of the above

Calcium carbide with heavy water generates-

1.  $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

2.  ${\mathrm{C}}_2{\mathrm{D}}_2$

3.  ${\mathrm{D}}_2{\mathrm{O}}_2$

4.  ${\mathrm{CaD}}_2$