Question:

How many mLmL of 0.125MCr3+0.125\, M \,Cr ^{3+} must be reacted with 12.00mL12.00 \,mL of 0.200MMnO40.200\, M\, MnO _{4}^{-}if the redox products are CrO72CrO _{7}^{2-} and Mn2+Mn ^{2+} ?

Updated On: Jul 27, 2022
  • 8 mL
  • 16 mL
  • 24 mL
  • 32 mL
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The Correct Option is D

Solution and Explanation

Equivalent of Cr3+=3×Cr ^{3 +}=3 \times moles of Cr3+Cr ^{3+} Equivalents of MnO4=5×MnO _{4}^{-}=5 \times moles of MnO4MnO _{4}^- Amount of Cr3+=0.125×VCr ^{3+}=0.125 \times V millimol =0125×V×3=0125 \times V \times 3 milliequivalent Amount of MnO4=0.200×12.00×5MnO _{4}^{-} =0.200 \times 12.00 \times 5 milli equivalent 0.125×V×3=0.200×12.00×50.125 \times V \times 3=0.200 \times 12.00 \times 5 V=32mLV=32 \,mL
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Concepts Used:

Oxidation and Reduction

What is Oxidation? 

Oxidation is a chemical process which can be explained by following four point of views 

In terms of oxygen transfer 

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Oxidation in Terms of Oxygen Transfer – Oxidation is gain of oxygen.

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In terms of oxygen transfer 

In terms of electron transfer 

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Reduction in Terms of Oxygen Transfer – Reduction is loss of oxygen.

What is Redox Reaction? 

A chemical reaction which involves transfer of electrons or change in oxidation number of atoms is called redox reaction.