Which of the following compounds contains bismuth in the +5 oxidation state?
1. \(\mathrm{Bi}_{2} \mathrm{O}_{5}\)
2. \(\mathrm{BiF}_{5}\)
3. \(\mathrm{BiCl}_{5}\)
4. \(\mathrm{Bi}_{2} \mathrm{~S}_{5}\)

Which of the following correctly represents the gaseous products formed on heating ammonium dichromate and barium azide, respectively?

How many moles of nitric oxide (NO) are formed when 2 moles of ammonia (NH₃) undergo oxidation?

1. Two (2)

2. Three (3)

3. Four (4)

4. Six (6)

Which of the following represents the oxidation state of the central atom in the hypophosphite ion, H₂PO₂⁻, present in NaH₂PO₂?

Which of the following species does not have a tetrahedral shape?

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. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)

In the preparation of compounds of Xe, Bartlett had taken \(O_{2}^{+}PtF_{6}^{-}\) as a base compound. This is because: 

1. Both ${\mathrm{O}}_2$ and Xe have same size.

2. Both ${\mathrm{O}}_2$ and Xe have same electron gain enthalpy.

3. Both ${\mathrm{O}}_2$ and Xe have almost same ionisation enthalpy.

4. Both Xe and ${\mathrm{O}}_2$ are gases.

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.

The correct statement among the following about SO₂ gas is:   

Which of the following statements is true?