The uses of 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):
1. | The stability of +5 oxidation state decreases down a group. |
2. | The stability of +3 oxidation state decreases down the group. |
3. | First ionization decreases on moving down a group. |
4. | Both (1) and (3) |
The main product(s) formed in the given reaction is/are:
The correct statement(s) among the given options is/are:
1. | NO2 has more resonating structures as compared to N2O5 |
2. | In the resonating structure of NO2 molecules positive charge is on the oxygen atom. |
3. | NO2 has fewer resonating structures than N2O5 |
4. | Both (1) and (2) |
Oxygen exists as gas and sulphur exists as a solid because:
1. Oxygen is less electronegative than sulphur.
2. Sulphur is smaller than oxygen molecule.
3. Sulphur has a tendency to form pπ-pπ bonds.
4. Oxygen has a tendency 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 , gives:
1. MnO
2. MnCl2
3. Cl2
4. Both (2) and (3)