$0.2$ g of a sample of ${{\rm{H}}_2}{{\rm{O}}_2}$ required $10$ mL of $N{\rm{KMn}}{{\rm{O}}_4}$ in a titration in the presence of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}{\rm{.}}$. Purity of ${{\rm{H}}_2}{{\rm{O}}_2}$ is :

100 mL of 0.1 M solution of a reductant is diluted to 1 litre, which of the following changes?

100 mL of 0.1 M solution of a reductant is diluted to 1 litre, which of the following changes?