The number of bonds and bonds in the following structure is :
1. | 6, 19 | 2. | 4, 20 |
3. | 5, 19 | 4. | 5, 20 |
The total number of possible resonance forms for the nitrate ion, () is:
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
The most preferred structure among the following with the lowest energy for SO3 is:
1. | 2. | ||
3. | 4. |
An incorrect statement regarding resonating structures is :
1. | The contributing structure must have the same number of unpaired electrons. |
2. | The contributing structures should have similar energies. |
3. | The resonance hybrid should have a higher energy than any of the contributing structures. |
4. | None of the above. |
can be represented by structures 1 and 2 shown below.
These two structures cannot be taken as the canonical forms of the resonance hybrid, because :
1. | The positions of the atoms have changed.
|
2. | The positions of the atoms are constant.
|
3. | H3PO3 does not show resonance.
|
4. | Two hydrogen atoms are missing. |
The correct order of 'SO' bond length is:
1. | \(\mathrm{SO}_3^{2-}>\mathrm{SO}_4^{2-}>\mathrm{SO}_3>\mathrm{SO}_2 \) |
2. | \(\mathrm{SO}_3^{2-}>\mathrm{SO}_4^{2-}>\mathrm{SO}_2>\mathrm{SO}_3 \) |
3. | \(\mathrm{SO}_4^{2-}>\mathrm{SO}_3^{2-}>\mathrm{SO}_2>\mathrm{SO}_3 \) |
4. | \(\mathrm{SO}_4^{2-}>\mathrm{SO}_3^{2-}>\mathrm{SO}_3>\mathrm{SO}_2\) |
Which of the following has a maximum 'Cl-O' bond order?
1.
2.
3.
4.
Mg2C3 reacts with water forming propyne . The number of sigma and pie bonds in \(C_{3}^{4-}\)is-
1. Two sigma and two pi bonds.
2. Three sigma and one pi bonds.
3. Two sigma and one pi bonds.
4. Two sigma and three pi bonds.