Q. No.A compound having two direct bonds
between P and H atoms is:
1. \(\mathrm{H}_3 \mathrm{PO}_2\)
2. \(\mathrm{H}_3 \mathrm{PO}_3\)
3. \(\mathrm{H}_3 \mathrm{PO}_4\)
4. \(\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7\)
NH3 forms a hydrogen bond but PH3 does not because:
| 1. | Phosphorus is more electronegative as compared to nitrogen. |
| 2. | Nitrogen is more electronegative as compared to phosphorus. |
| 3. | Nitrogen and phosphorous have equal electronegativity. |
| 4. | Nitrogen is more stable as compared to phosphorus. |
Why does nitrogen exist as N₂ while phosphorus exists as P₄?
| 1. | The tendency to form pπ–pπ bonds decreases on moving up the group. |
| 2. | The tendency to form pπ–pπ bonds decreases on moving down the group. |
| 3. | The tendency to form dπ–dπ bonds decreases on moving down the group. |
| 4. | The tendency to form dπ–dπ bonds decreases on moving up the group. |
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. |
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.
| 1. | Neon gas is filled in discharge tubes with characteristic colours. |
| 2. | Neon gas is used in beacon lights. |
| 3. | Argon along with nitrogen is used in gas-filled electric lamps. |
| 4. | All of the above. |
Choose the incorrect statement among the following regarding noble gases:
| 1. | Noble gases have weak dispersion forces. |
| 2. | Noble gases have large positive values of electron gain enthalpy. |
| 3. | Noble gases are sparingly soluble in water. |
| 4. | Noble gases have very high melting and boiling points. |
| Assertion (A): | The valency and oxidation number of sulphur in S8 respectively are 2 and 0. |
| Reason (R): | S8 Rhombic is the most stable allotropic form of sulphur. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
| Assertion (A): | Noble gases have the highest ionization energies in their respective periods. |
| Reason (R): | The outermost sub-shell of noble gases in which the electron enters is completely filled. |
Select the correct option based on statements below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
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