Which of the following elements does not show allotropy?
1. Nitrogen
2. Bismuth
3. Antimony
4. Arsenic
The maximum covalency of nitrogen is:
1. | 3 | 2. | 5 |
3. | 4 | 4. | 6 |
Which of the following statements is wrong?
1. | Single N—N bond is stronger than a single P—P bond. |
2. | can act as a ligand in the formation of coordination compound with transition elements. |
3. | is paramagnetic in nature. |
4. | Covalency of nitrogen in is four. |
A brown ring is formed in the ring test for ion. It is due to the formation of:
1. [Fe(H2O)5(NO)]2+
2. FeSO4.NO2
3. [Fe(H2O)4 (NO)2]2+
4. FeSO4. HNO3
Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well-characterized compound in +5 oxidation state. The compound is-
On heating ammonium dichromate and barium azide separately we get:
1. | in both cases |
2. | with ammonium dichromate and with barium azide |
3. | with ammonium dichromate and with barium azide |
4. | with ammonium dichromate and with barium azide |
In the preparation of , we get gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of will be:
1. | 2 | 2. | 3 |
3. | 4 | 4. | 6 |
In solid-state, PCl5 exists as:
1. | Covalent solid. |
2. | Octahedral structure. |
3. | Ionic solid with [PCl6]+ octahedral and [PCl4]- tetrahedral. |
4. | Ionic solid with [PCl4]+ tetrahedral and [PCl6]- octahedral. |
Which of the following is correct for P4 molecule of white phosphorus?
a. It has 6 lone pairs of electrons
b. It has six P — P single bonds
c. It has three P — P single bonds
d. It has four lone pairs of electrons
Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
Which of the following statements are correct?
a. | All the three N – O bond lengths in HNO3 are equal. |
b. | All P – Cl bond lengths in PCl5 molecule in the gaseous state are equal. |
c. | P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive. |
d. | PCl5 is ionic in a solid-state in which cation is tetrahedral and the anion is octahedral. |