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Q. No.Which of the following best explains why PCl₃ and PCl₅ both exist, whereas NCl₃ exists but NCl₅ does not exist?
| 1. | Lower electronegativity of P and N |
| 2. | Lower tendency of N to form a covalent bond |
| 3. | Availability of vacant d-orbital in P but not in N |
| 4. | The statement is incorrect |
Subtopic: Group 15 - Preparation, Properties & Uses |
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The condition(s) required to maximize the yield of ammonia in Haber process is/are:
| 1. | High pressure (200 atm) condition |
| 2. | High temperature of 700 K |
| 3. | Use of a catalyst such as iron oxide mixed with small amounts of K2O and Al2O3 |
| 4. | All of the above |
Subtopic: Group 15 - Preparation, Properties & Uses |
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Level 1: 80%+
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Given below are two statements:
| Assertion (A): | NO2 dimerize to form N2O4 |
| Reason (R): | NO2 contains an odd number of valence electrons. On dimerization, a stable N2O4 molecule is formed with an even number of electrons. |
| 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 15 - Preparation, Properties & Uses |
91%
Level 1: 80%+
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Given below are two statements Assertion(A) and Reason(R):
Select the correct option:
| Assertion (A): | R3P=O exists but R3N=O does not where R= alkyl group). |
| Reason (R): | Nitrogen doesn't have d orbitals. |
Select the correct option:
| 1. | (A) is true and (R) is the correct explanation of (A). |
| 2. | (A) is 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 15 - Preparation, Properties & Uses |
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Which of the following elements can be involved in pπ-dπ bonding?
1. Carbon
2. Nitrogen
3. Phosphorus
4. Boron
Subtopic: Group 15 - Preparation, Properties & Uses |
89%
Level 1: 80%+
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Which of the following explains why N₂ is less reactive at room temperature?
1. High polarising power
2. High bond dissociation energy
3. High ionic character
4. None of the above
1. High polarising power
2. High bond dissociation energy
3. High ionic character
4. None of the above
Subtopic: Group 15 - Preparation, Properties & Uses |
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Level 1: 80%+
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An iron catalyst is used in the Haber process in which gaseous N2 and H2 react to produce NH3. What is the role of this catalyst?
| 1. | It provides a pathway with a lower activation energy. |
| 2. | It increases the equilibrium constant of the reaction. |
| 3. | It raises the kinetic energies of the reactants. |
| 4. | It interacts with the NH3. |
Subtopic: Group 15 - Preparation, Properties & Uses |
87%
Level 1: 80%+
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Which of the following accounts for the higher boiling point of NH₃ compared to PH₃?
| 1. | NH3 is ionic compound and PH3 is covalent compound |
| 2. | The size of phosphorus is greater than nitrogen |
| 3. | Strong vander wall forces in NH3 than PH3 |
| 4. | Hydrogen bonding occur in NH3 but not in PH3 |
Subtopic: Group 15 - Preparation, Properties & Uses |
86%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | H3PO2 is a strong reducing agent. |
| Reason (R): | All oxyacids of phosphorus that have P-H bonds act as strong reducing agents. H3PO2 has two P-H bonds hence, it acts as a strong reducing agent. |
Choose the correct option:
| 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 15 - Preparation, Properties & Uses |
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Level 1: 80%+
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Which of the following represents the oxidation states of phosphorus in H4P2O5, H4P2O6, H4P2O7, respectively?
| 1. | +3, +5, +4 | 2. | +5, +3, +4 |
| 3. | +5, +4, +3 | 4. | +3, +4, +5 |
Subtopic: Group 15 - Preparation, Properties & Uses |
87%
Level 1: 80%+
AIPMT - 2010
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