Q. No.Bismuth is present in a +5 oxidation state in:
1. \(\mathrm{Bi}_{2} \mathrm{O}_{5}\)
2. \(\mathrm{BiF}_{5}\)
3. \(\mathrm{BiCl}_{5}\)
4. \(\mathrm{Bi}_{2} \mathrm{~S}_{5}\)
1. \(\mathrm{Bi}_{2} \mathrm{O}_{5}\)
2. \(\mathrm{BiF}_{5}\)
3. \(\mathrm{BiCl}_{5}\)
4. \(\mathrm{Bi}_{2} \mathrm{~S}_{5}\)
Ammonium dichromate and barium azide on heating gives:
| 1. | N2 in both cases. |
| 2. | N2 with ammonium dichromate and NO with barium azide. |
| 3. | N2O with ammonium dichromate and N2 with barium azide. |
| 4. | N2O with ammonium dichromate and NO2 with barium azide. |
The number of moles of NO produced by the oxidation of two moles of NH3 will be -
1. 2
2. 3
3. 4
4. 6
The oxidation state of the central atom in the anion of compound \(\mathrm{NaH}_2 \mathrm{PO}_2\) will be:
| 1. | +3 | 2. | +5 |
| 3. | +1 | 4. | -3 |
A compound that does not have a tetrahedral shape is:
1. \(\mathrm{NH}_{4}^{+}\)
2. \(\mathrm{SiCl}_{4}\)
3. \(\mathrm{SF}_{4}\)
4. \(\mathrm{SO}_{4}^{2-}\)
Which of the following are peroxoacids of sulphur?
1. \(\mathrm{H}_{2} \mathrm{SO}_{5} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\)
2. \(\mathrm{H}_{2} \mathrm{SO}_{5} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)
3. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\)
4. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)
Which of the following is true regarding the P4 molecule of white phosphorus?
1. It has 6 lone pairs of electrons.
2. It has four P — P single bonds.
3. It has three P — P single bonds.
4. It has four lone pairs of electrons.
Which of the following statements is true?
| 1. | All three N – O bond lengths in HNO3 are equal. |
| 2. | All P – Cl bond lengths in PCl5 molecule in gaseous state are equal. |
| 3. | P4 molecules in white phosphorus have angular strain. Therefore, white phosphorus is very reactive. |
| 4. | PCl5 is ionic in a solid state in which the anion is tetrahedral and the cation is octahedral. |
Which of the following is the correct match?
1. As2O3 < SiO2 < P2O3 < SO2 - Basic strength.
2. AsH3 < PH3 < NH3 - Enthalpy of vaporisation.
3. S < O < Cl < F - More negative electron gain enthalpy
4. H2O > H2S > H2Se > H2Te - Thermal stability
Which of the following statements is true?
| 1. | S — S bond is present in H2S2O6 |
| 2. | In peroxosulphuric acid (H2SO5) sulphur is in +5 oxidation state. |
| 3. | Iron powder, along with Al2O3 and K2O, is used as a catalyst in the preparation of NH3 by Haber's process. |
| 4. | Change in enthalpy is positive for the preparation of SO3 by catalytic oxidation of SO2 |
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