Correct Answer - A
समपरासरी विलयन का आण्विक सांद्रण समान होता है ,
अतः `(n_(1))/(V_(1))=(n_(2))/(V_(2))`
`implies((w_(1))/(m_(1)))/(V_(1))=((w_(2))/(m_(2)))/(V_(2))`
`implies(1.05)/((m_(1))/(100))=(3)/((180)/(100))`
`therefore m_(1) =(1.05xx180)/(3) =m_(1) =63`
