Which of the following is known as oil of vitriol ?
\({H_2SO_4}\)
\({HF}\)
\({ZnSO_4}\)
\({HNO_3}\)
Sulfuric acid (H2SO4) is called as oil of vitriol. Sulphuric acid is a strong acid that is used in industrial processes. The oil of vitriol is due to the oily appearance of the concentrated sulphuric acid.
So, the correct answer is (A): H2SO4
Given below are two statements. 
In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements:
Statement I: Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $\mathrm{p} \pi-\mathrm{p} \pi$ bond with oxygen.
Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of the above statements, choose the correct answer from the options given below:
Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. $(\mathrm{B}<\mathrm{Al}),(\mathrm{Al}<\mathrm{Ga}),(\mathrm{Ga}<\mathrm{In})$ and $(\mathrm{In}<\mathrm{Tl})$ Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius $\left(\mathrm{M}^{3+}\right)$ than the other one. The atomic number of the element (X) is