The uses of ${\mathrm{ClO}}_2$ is /are-

1. It is used for purifying water

2. It is used as a bleaching agent

3. Both '1'and '2'

4. None of the above

Halogens are colored because -

1. They absorb radiations in the U.V region

2. They absorb radiations in the visible region

3. They absorb radiations in the infrared region

4. They absorb radiations in the radiowaves region

 4HCl + O₂ →  X + 2H₂O

Cl₂ + H₂O → HCl  + Y ;

X and Y in the above reaction are respectively:

1.  Cl₂ , HOCl

2. HOCl ,Cl₂

3. HClO₃, HOCl

4. HOCl, HClO₄

A neutral molecule that is isoelectronic with ClO^- is -

1. ClF which is a Lewis base

2. ClF which is a Lewis acid

3. HCl which is a Lewis base

4. HCl which is a Lewis acid

The correct statement(s) regarding group 15 elements is/(are):

The main product(s) formed in the given reaction is/are:

${\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)+{\mathrm{NaNO}}_2\left(\mathrm{aq}\right)\to ....+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+\mathrm{NaCl}\left(\mathrm{aq}\right)$

$1.<mspace\; width="1em"></mspace>{\mathrm{NH}}_3$
$2.<mspace\; width="1em"></mspace>{\mathrm{N}}_2$
$3.<mspace\; width="1em"></mspace>{\mathrm{N}}_2{\mathrm{H}}_4$
$4.<mspace\; width="1em"></mspace>\mathrm{Both}<mspace\; width="1em"></mspace>\left(1\right)\hspace{0.17em}\mathrm{and}\left(3\right)$

The correct statement(s) among the given options is/are:

Which of the following explains why oxygen is a gas while sulphur is a solid?

1. Oxygen is less electronegative than sulphur.

2. Sulphur is smaller than the oxygen molecule.

3. Sulphur readily forms pπ–pπ bonds.

4. Oxygen tends to form pπ-pπ bonds.

The products formed by the reaction of F₂ and Cl₂ with water respectively are:

1. HF , HCl

2. H₂F₂ , HOCl

3. HF, HClO₃

4. H₂F₂, HClO₄

NaCl when heated with sulphuric acid in the presence of ${\mathrm{MnO}}_2$, gives:

1. MnO

2. MnCl₂

3. Cl₂

4. Both (2) and (3)