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Q.

The reaction between H2O2 and KMnO4 is 2KMnO4 + 3H2SO4 + 5H2O2 → K2SO4 + 2MnSO4 + 8H2O + 5O2.If 30 ml H2O2 is required to reduce 15 ml 0.02 M KMnO4 solution, the molarity of H2O2 is

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a

0.05 M

b

0.02 M

c

0.04 M

d

0.025M

answer is A.

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Detailed Solution

2 KMnO4 + 3H2SO4 + 5H2O2 → K2SO4 + 2MnSO4 + 8H2O + 5O2

No of equivalents of H2O2 = No of equivalents of KMnO4
 

\large [N_1V_1]_{H_2O_2}\;\;=\;\;[N_2V_2]_{KMnO_4}


N1 x 30 = 0.02 x 5 x 15
 

\large \\\therefore\;\;N\;=\;\frac{No\;of\;equivalents}{V(in\:lit)}\\\\\because\;N\;=\;M\times n-Factor\\\\=\;0.02\times 5


 

\large \\\\N_1\;=\;\frac{0.02\times 5\times 15}{30}\\\\N_1\;=\;0.01\times 5\\\\N_1\;=\;0.05N\\\\M_{H_2O_2}\;=\;\frac{N_1}{N-factor}\;=\;\frac{N_1}{Basicity}\\\\M_{H_2O_2}\;=\;\frac{0.05}{2}\;=\;0.025M


 

\large \therefore

0.025M,30ml H2O2 is required to reduce 15ml of 0.02M KMnO4 solution.

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