Which of the following statements is false? 

Which of the following is the correct electronic configuration of the element belonging to Group 15 and Period 3 of the periodic table?
1. \(\mathrm{1 s^2 2 s^2 2 p^4} \)
2. \(\mathrm{1 s^2 2 s^2 2 p^3} \)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2} \)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)

Which of the following gases is the easiest to liquefy?

Which of the following orders is incorrect for the given properties of halogens?

Which of the following correctly represents the order of boiling points of the given substances?

1. H₃PO₄ < H₂SO₄

2. H₂O > H₂O₂

3. H₂O > SiC

4. NH₃ > HF

Which of the following compounds contains an O–O peroxide linkage?

1. ${\mathrm{H}}_2{\mathrm{SO}}_4$$,$ $\mathrm{Sulphuric}$ $\mathrm{acid}$

2. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8,$ $\mathrm{Peroxodisulphuric}$ $\mathrm{acid}$

3. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7,$ $\mathrm{Pyrosulphuric}$ $\mathrm{acid}$

4. ${\mathrm{H}}_2{\mathrm{SO}}_3,$ $\mathrm{Sulphurous}$ $\mathrm{acid}$

Which of the following sequences correctly represents the increasing order of acidic strength?

1. HClO₂ < HClO₃ < HClO₄

2. H₃PO₄ < H₃PO₃ < H₃PO₂

3. CH₄ < NH₃ < H₂O < HF

4. All of the above.

Which of the following is a common use of sulphuric acid?