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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%
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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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%
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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%
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Select the correct option based on statements below:
| Assertion (A): | The atomic size of F is smaller than that of Cl. |
| Reason (R): | F-F bond is stronger than the Cl-Cl bond. |
| 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. | (A) is false but (R) is true. |
Subtopic: Group 17 - Preparation, Properties & Uses |
65%
From NCERT
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Select the correct option based on statements below:
| Assertion (A): | NaCl reacts with concentrated H2SO4 to give colourless fumes with a pungent smell. But on adding MnO2, the fumes become greenish-yellow |
| Reason (R): | MnO2 oxidizes HCl to chlorine gas which is greenish-yellow. |
| 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. | (A) is false but (R) is true. |
Subtopic: Group 17 - Preparation, Properties & Uses |
85%
From NCERT
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Select the correct option based on statements below:
| Assertion (A): | Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2. |
| Reason (R): | Oxygen forms pπ - pπ multiple bonds due to its small size and small bond length but pπ - pπ bonding is not possible in 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 |
71%
From NCERT
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(a) XeF6 + 3H2O →
(b) XeF6 + H2O
The products formed in the above reactions, respectively, are:
1. XeO3 , XeOF4
2. XeO6 , XeOF4
3. XeO3, XeOF6
4. XeO6 , XeOF6
Subtopic: Group 18 - Preparation, Properties & Uses |
81%
From NCERT
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