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  • Solve this problem - Redox Reaction and Electrochemistry - JEE Main-2

Consider the equation :

2KMnO_4 + 3H_2SO_4 \rightarrow K_2SO_4 + 2MnSO_4 + 3H_2O + 5[O]

What is the equivalent mass of KMnO4 ?

  • Option 1)

    316

  • Option 2)

    31.6

  • Option 3)

    158

  • Option 4)

    15.8

 

Answers (1)

best_answer

As we have learnt,

 

Equivalent mass -

It is equal to the molecular or atomic mass divided by the number of electrons involved in the reaction per molecule, atom or ion.

- wherein

e.g. 2H_{2}O\:+\:2e^{-}\rightarrow H_{2}\:+\:2OH^{-}

2 Faraday of electricity is used to produce one mole of gas 

\therefore    Eq. Mass of hydrogen=\frac{2.016}{2}=1.008

 

 80 g of oxygen is produced by 316 g of kMnO4 

8 g \rightarrow 31.6 g\;of\;KMnO_4

Equivalent mass of KMnO4 in acidic medium is 31.6 

 


Option 1)

316

Option 2)

31.6

Option 3)

158

Option 4)

15.8

Posted by

Plabita

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