Volume strength of \\\\(H_{ 2 }{ O }_{ 2 } = 5.6\ imes \ ext{N}\\\\) \\\\((\ ext{N} =\\\\) Normality\\\\()\\\\)Normality of \\\\(10\\\\) vol of \\\\(H_{ 2 }{ O }_{ 2 } = \\dfrac{10}{5.6}\ ext{N}\\\\)Normality of \\\\(15\\\\) vol of \\\\(H_{ 2 }{ O }_{ 2 } = \\dfrac{15}{5.6} \ ext{N}\\\\)Normality of \\\\(20\\\\) vol of \\\\(H_{ 2 }{ O }_{ 2 } = \\dfrac{20}{5.6} \ ext{N}\\\\)Let \\\\(500\\\\) ml of each is mixed, then the total volume of mix \\\\(= 1500\\\\) ml.Also, this is diluted to double its volume, i.e., \\\\(= 3000\\\\) ml\\\\(\ ext{N}\ imes 3000\\\\) = \\\\(\\dfrac { 10 }{ 5.6 } \ imes 500+\\dfrac { 15 }{ 5.6 } \ imes 500+\\dfrac { 20 }{ 5.6 } \ imes 500\\\\)Normality of \\\\(H_{ 2 }{ O }_{ 2 }\\\\) mix \\\\(= 1.339\\:\ ext{N}\\\\)Vol. strength of \\\\(H_{ 2 }{ O }_{ 2 } = 1.339 \ imes 5.6 = 7.5\\\\).