200 ml of $1\mathrm{M} {\mathrm{H}}_2{\mathrm{SO}}_4,$300ml 3M HCl and100mlof 2M HCl l are mixed and made up to 1 litre. The proton concentration in the resulting solution is

Basicity of ${\mathrm{H}}_2{\mathrm{SO}}_4\to 2\left(1\right)=2$

Basicity of HCl$\to 3\left(1\right)=2$

Proton concentration in resulting solution $=\frac{{\mathrm{N}}_1{\mathrm{V}}_1+{\mathrm{N}}_2{\mathrm{V}}_2+{\mathrm{N}}_3{\mathrm{V}}_{3 }}{\mathrm{total} \mathrm{volume}}$

$=\frac{2\times 200+3\times 300+100\times 2}{1000}$

$=\frac{1500}{1000}$

$=\frac{15}{10}$

=1.5