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

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.

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?  

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