Sulphuric acid is used:

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

The number of \(\mathrm{S=O}\) bonds present in \(\mathrm{H}_2\mathrm{S}_2 \mathrm{O}_8\) is:

Incorrect order among the following is:

Which of the following has the least bond angle?

1. H₂O

2. NH₃

3. CH₄

4. CO₂

Among the following hydrides that has the lowest boiling point is:

1. ${\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{H}}_2\mathrm{S}$

3. ${\mathrm{H}}_2\mathrm{Se}$

4. ${\mathrm{H}}_2\mathrm{Te}$

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

1. ${\mathrm{H}}_3{\mathrm{PO}}_{\mathrm{4<mspace\; width="1em"></mspace>}}<\hspace{0.17em}{\mathrm{H}}_2{\mathrm{SO}}_4$

2. ${\mathrm{H}}_2\mathrm{O<mspace\; width="1em"></mspace>}>\hspace{0.17em}{\mathrm{H}}_2{\mathrm{O}}_2$

3. ${\mathrm{H}}_2\mathrm{O<mspace\; width="1em"></mspace>}>\hspace{0.17em}\mathrm{SiC}$

4. ${\mathrm{NH}}_{\mathrm{3<mspace\; width="1em"></mspace>}}>\hspace{0.17em}\mathrm{HF}$