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Q. No.
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.
Subtopic: Group 15 - Preparation, Properties & Uses |
90%
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Nitrogen exists as a diatomic molecule and phosphorus as P4 because on moving
| 1. | up a group, the tendency to form pπ−pπ bonds decreases. |
| 2. | down a group, the tendency to form pπ−pπ bonds decreases. |
| 3. | down a group, the tendency to form dπ−dπ bonds decreases. |
| 4. | up a group, the tendency to form dπ−dπ bonds decreases. |
Subtopic: Group 15 - Preparation, Properties & Uses |
77%
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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%
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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%
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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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Among the following statements, the correct one(s) is/are:
| 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. |
Subtopic: Group 18 - Preparation, Properties & Uses |
92%
From NCERT
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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. |
Subtopic: Group 18 - Preparation, Properties & Uses |
59%
From NCERT
NEET - 2021
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Subtopic: Group 15 - Preparation, Properties & Uses |
81%
From NCERT
AIPMT - 1999
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Select the correct option based on statements below:
| 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. |
Subtopic: Group 16 - Preparation, Properties & Uses |
70%
From NCERT
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Select the correct option based on statements below:
| 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. |
| 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. |
Subtopic: Group 18 - Preparation, Properties & Uses |
From NCERT
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