The catalyst that is used in the contact process is:

1. Fe2O3

2. Al2O3

3. V2O5

4. SO3

Subtopic:  Group 16 - Preparation, Properties & Uses |
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The chemical formula of oleum is - 

1. H2S2O8

2. H2S2O7

3. H3S2O6

4. H2SO5

Subtopic:  Group 16 - Preparation, Properties & Uses |
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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 |
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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 |
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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 |
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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 |
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