Q. No.The important condition/s required for the linear combination of atomic orbitals to form molecular orbitals is:
| 1. | The combining atomic orbitals must have the exact or nearly the same energy. |
| 2. | The combining atomic orbitals must have proper symmetry about the molecular axis. |
| 3. | The combining atomic orbitals must overlap to the maximum extent. |
| 4. | All of these. |
\(\mathrm{F}_2, \mathrm{~N}_2, \mathrm{Ne}_2, \mathrm{O}_2, \mathrm{Li}_2, \mathrm{Be}_2\)
1. 1
2. 4
3. 6
4. 9
According to the MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?
1.
2.
3.
4.
1. \(\mathrm{O}_2^{-}, \mathrm{N}_2^{-}\)
2. \(\mathrm{O}_2^{-}, \mathrm{N}_2^{+}\)
3. \(\mathrm{O}_2^{+}, \mathrm{N}_2^{-} \)
4. \(\mathrm{O}_2, \mathrm{~N}_2 \)
| Assertion (A): | An atomic orbital is monocentric, whereas a molecular orbital is polycentric. |
| Reason (R): | An electron in an atomic orbital is influenced by one nucleus whereas in a molecular orbital, it is influenced by two or more nuclei depending upon the number of atoms in a molecule. |
In the light of the above statements, choose the most appropriate answer from the options given 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. |
Which of the following have identical bond order?
(a)
(b)
(c)
(d)
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (b), (d)
Match the species in Column-I with the bond order in Column-II.
|
Column-I |
Column-II |
||
| A. |
NO |
(i). |
1.5 |
| B. |
CO |
(ii). |
2.0 |
| C. |
\(O_2^-\) |
(iii). |
2.5 |
| D. |
O2 |
(iv). |
3.0 |
Choose the correct option:
| Options: | A | B | C | D |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
Match List-I (Molecules) with List-II (Bond order),
and mark the appropriate choice
| List-I (Molecule) | List-II (Bond order) |
|
(a) Ne2 (b) N2 (c) F2 (d) O2 |
(i) 1 (ii) 2 (iii) 0 (iv) 3 |
Choose the correct match from the options given below :
1. (a) (iii), (b) (iv), (c) (i), (d) (ii)
2. (a) (i), (b) (ii), (c) (iii), (d) (iv)
3. (a) (ii), (b) (i), (c) (iv), (d) (iii)
4. (a) (iv), (b) (iii), (c) (ii), (d) (i)
| List-I (Expressions) |
List-II (Property) |
||
| A. | \(\Psi_{M O}=\Psi_A-\Psi_B\) | I. | Dipole moment |
| B. | \(\mu=Q \times r\) | II. | Bonding molecular orbital |
| C. | \(\frac{N_b-N_a}{2}\) | III. | Anti-bonding molecular orbital |
| D. | \(\Psi_{M O}=\Psi_A+\Psi_B\) | IV. | Bond order |
| 1. | A-II, B-I, C-IV, D-III | 2. | A-III, B-IV, C-I, D-II |
| 3. | A-III, B-I, C-IV, D-II | 4. | A-III, B-IV, C-II, D-I |
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