On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are-
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)