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QJEEAdv07Ch79de: JEE Advanced 2007 Chemistry - Class 11 JEEAdv07Ch79de Solution: Consider a titration of potassium dichromate solution with…

Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is

Multiple Choice Options

  • A 3
  • B 4
  • C 5
  • D 6

Step-by-Step Verified Solution

The formula of Mohr's salt is FeSO4(NH4)2SO4. It is a mixture of ferrous sulfate and ammonium sulfate. Ferrous sulfate is oxidized by potassium dichromate to ferric sulphate.

Reaction is as follows:

K2Cr2O7+6FeSO4+7H2SO4→K2SO4+Cr2(SO4)3+3Fe2(SO4)3+7H2O

1 mole of potassium dichromate reacts with 6 moles of ferrous sulphate. Thus, number of moles of Mohr's salt required per mole of dichromate is 6.

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