The catalyst that is used in the contact process is:
1. | Fe2O3 | 2. | Al2O3 |
3. | V2O5 | 4. | SO3 |
The chemical formula of oleum is -
1. | H2S2O8 | 2. | H2S2O7 |
3. | H3S2O6 | 4. | H2SO5 |
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- |
A chemical that depletes the ozone layer is:
1. Sulphur
2. Chlorofluorocarbons (CFCs)
3. Nitrogen
4. Hydrogen
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. |
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.