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?
1. | \(\mathrm{H_{2} SO_{5} } \text{ and } \mathrm{H_{2} S_{2} O_{8}}\) | 2. | \(\mathrm{H_{2} SO_{5 }} \text{ and } \mathrm{H_{2} S_{2} O_{7}}\) |
3. | \(\mathrm{H_{2} S_{2} O_{7}} \text{ and } \mathrm{H_{2} S_{2} O_{8}}\) | 4. | \(\mathrm{H_{2} S_{2} O_{6}} \text{ and } \mathrm{H_{2} S_{2} O_{7}}\) |
Hot conc. acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. into two gaseous products?
1. | Cu | 2. | S |
3. | C | 4. | Zn |
A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When an excess of this gas reacts with an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from-
1. –3 to +3
2. –3 to 0
3. –3 to +5
4. 0 to –3
In the preparation of compounds of Xe, Bartlett had taken as a base compound. This is because:
1. | Both O2 and Xe have the same size. |
2. | Both O2 and Xe have the same electron gain enthalpy. |
3. | Both O2 and Xe have almost the same ionisation enthalpy. |
4. | Both Xe and O2 are gases. |