If the main axis of a diatomic molecule is z, then the molecular orbital px and py overlap to form which of the following orbital:
1. molecular orbtial
2. σ molecular orbital
3. δ molecular orbtial
4. No bond will form
BF3 is a planar and an electron deficient compound. Hybridization and number of electrons around the central atom, respectively are:
1. sp2 and 6
2. sp2 and 8
3. sp3 and 4
4. sp3 and 6
Match List - I with List - II
List - I | List - II | ||
(a) | (i) | Square pyramidal | |
(b) | (ii) | Trigonal planar | |
(c) | (iii) | Octahedral | |
(d) | (iv) | Trigonal bipyramidal |
Choose the correct answer from the options given below:
(a) | (b) | (c) | (d) | |
1. | (iii) | (i) | (iv) | (ii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (iv) | (iii) | (i) | (ii) |
4. | (ii) | (iii) | (iv) | (i) |
Which pair of ions from the following list do not constitute an iso-electronic pair?
1. Mn2+, Fe3+
2. Fe2+, Mn2+
3. O2–, F–
4. Na+, Mg2+
Which molecule among the following is non-polar?
1. | SbCl5 | 2. | NO2 |
3. | POCl3 | 4. | CH2O |
The incorrect statements among the following for sigma- and pi- bonds formed between two carbon atoms is:
1. | Sigma-bond is stronger than a pi-bond |
2. | Bond energies of sigma- and pi-bonds are of the order of 264 KJ/mol and 347 KJ/mol, respectively |
3. | Free rotation of atoms about a sigma bond is allowed but not in the case of a pi-bond |
4. | Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard |
Which of the following two species in the pair are isostructural:
1.
2.
3.
4.
Incorrect statement about peptide bond is:
1. | C–N bond length in proteins is longer than the usual bond length of N-bond. |
2. | Spectroscopic analysis shows the planar structure of group. |
3. | C–N bond length in proteins is smaller than the usual bond length of the C–N bond. |
4. | None of the above. |
In NO3– ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:
1. | 2, 2 | 2. | 3, 1 |
3. | 1, 3 | 4. | 4, 0 |