The respective oxidation states of P in H₄P₂O₅, H₄P₂O₆, and H₄P₂O₇ are: 

1.	+3, +5, and +4	2.	+5, +3, and +4
3.	+5, +4, and +3	4.	+3, +4, and +5

Which of the following statements is false? 

An element belongs to group 15 and 3^rd period of the periodic table. Its electronic configuration would be:
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?

Incorrect order among the following is:

Which of the following compounds is not an acidic salt?

1. NaH₂PO₂

2. NaH₂PO₃

3. Na₂H₂S₂O₇

4. NaH₂PO₄

Hydrogen peroxide can be generated by the hydrolysis of

1. ${\mathrm{HNO}}_3$

2. ${\mathrm{H}}_2{\mathrm{P}}_2\mathrm{O}$

3. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$

4. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_6$

Which sequence of the following, in terms of boiling point, is correct?

1. ${\mathrm{H}}_3{\mathrm{PO}}_{\mathrm{4 }}< {\mathrm{H}}_2{\mathrm{SO}}_4$

2. ${\mathrm{H}}_2\mathrm{O }> {\mathrm{H}}_2{\mathrm{O}}_2$

3. ${\mathrm{H}}_2\mathrm{O }> \mathrm{SiC}$

4. ${\mathrm{NH}}_{\mathrm{3 }}> \mathrm{HF}$