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Q. No.PCl3 and PCl5 both exist; NCl3 exists but NCl5 does not exist. It is due to:
| 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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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 |
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| Assertion (A): | R3P = O exists but R3N = O does not (R = alkyl group). |
| Reason (R): | Nitrogen doesn't have d orbitals. |
| 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 |
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N2 is less reactive at room temperature due to -
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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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 |
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PH3 has a lower boiling point than NH3 because-
| 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 |
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Given below are two statements:
| Assertion (A): | H3PO2 is a 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. |
| 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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Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are 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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