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
The oxidation state of the central atom in the anion of the compound will be-
1. +3
2. +5
3. +1
4. -3
Which of the following is not tetrahedral in shape?
Which of the following are peroxoacids of sulphur?