The correct sequence of increasing covalent character is represented by:
1.
2.
3.
4.
Which of the following is the electron deficient molecule:
1. C2H6
2. SiH4
3. PH3
4. B2H6
A species that does not exhibit paramagnetism is:
1. N2+
2. O2–
3. CO
4. NO
In , formal charge on every oxygen atom and P-O bond order respectively are:
1. -0.75 and 1.25
2. -0.5 and 2
3. 1 and 1.5
4. -0.75 and 2
Among the following, the pair in which the two species are not isostructural is:
1.
2.
3.
4.
H2O is dipolar, whereas BeF2 is not. It is because:
1. | H2O involves hydrogen bonding whereas BeF2 is a discrete molecule. |
2. | H2O is linear and BeF2 is angular. |
3. | H2O is angular and BeF2 is linear. |
4. | The electronegativity of F is greater than that of O |
In a regular octahedral molecule, MX6, the number of X–M–X bonds at 180º is:
1. | Two | 2. | Six |
3. | Four | 4. | Three |
The lone pairs in the BrF3 molecule, occupy equatorial positions to minimize:
1. | Bond pair – bond pair repulsion only |
2. | Lone pair – lone pair repulsion and lone pair–bond pair repulsion |
3. | Lone pair – lone pair repulsion only |
4. | Lone pair – bond pair repulsion only |
The dipole moment of compound AB is 10.92 D and that of compound CD is 12.45 D. If the bond length of AB is 2.72 A° and that of CD is 2.56 A°, then for these compounds the correct statement is:
1. More ionic nature in AB
2. More ionic nature in CD
3. Equal in both
4. Cannot be predicted