Which of the following sets of quantum numbers represents the highest energy of an atom?

The density (in g mL^-1) of a 3.60 M sulphuric acid solution that is 29% H₂SO₄ (molar mass = 98 g mol^-1) by mass will be

In the reaction

2Al(s) + 6HCl(aq) $$\to$$ 2Al³⁺ (aq) + 6Cl^-(aq) + 3H₂(g)

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is