- 1(current)
Q. No.Subtopic: Group 16 - Preparation, Properties & Uses |
91%
From NCERT
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Subtopic: Group 16 - Preparation, Properties & Uses |
90%
From NCERT
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The electron gain enthalpy values for O → O– and O → O2– are –141 and 702 kJ mol-1 , respectively. The correct statement about the formation of oxides is-
| 1. | Higher the electron gain enthalpy lower is the lattice energy. |
| 2. | Higher the electron gain enthalpy higher is the lattice energy. |
| 3. | Higher the electron gain enthalpy higher is the stability of oxide. |
| 4. | O- is more stable than O2- |
Subtopic: Group 16 - Preparation, Properties & Uses |
From NCERT
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A chemical that depletes the ozone layer is:
1. Sulphur
2. Chlorofluorocarbons (CFCs)
3. Nitrogen
4. Hydrogen
Subtopic: Group 16 - Preparation, Properties & Uses |
95%
From NCERT
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Oxygen forms hydrogen bonds while chlorine does not, because :
| 1. | Chlorine has a bigger size and as a result, a higher electron density per unit volume. |
| 2. | Oxygen has a smaller size and as a result, a lower electron density per unit volume. |
| 3. | Oxygen has a smaller size and as a result, a higher electron density per unit volume. |
| 4. | Oxygen has a bigger size and as a result, a higher electron density per unit volume. |
Subtopic: Group 16 - Preparation, Properties & Uses |
73%
From NCERT
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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.
Subtopic: Group 16 - Preparation, Properties & Uses |
76%
From NCERT
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