Question:
Consider a titration of potassium dichromate with acidified Mohr?s salt solution using diphenylamine as indicator. The number of moles of Mohr?s salt required per mole of dichromate is :
Consider a titration of potassium dichromate with acidified Mohr?s salt solution using diphenylamine as indicator. The number of moles of Mohr?s salt required per mole of dichromate is :
Updated On: Sep 17, 2023
- $3$
- $4$
- $5$
- $6$
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The Correct Option is D
Solution and Explanation
${6Fe^{2+} + Cr2 \,O^{2-}_7 + 14H+ -> 6Fe^{3+} + 2Cr^{3+} + 7H_2O}$
Mohr?s salt $ \left[FeSO_{4}\cdot \left(NH_{4}\right)_{2}SO_{4}\cdot6H_{2}O\right]$
and dichromate reacts in $6 : 1$ molar ratio.
So, no. of moles of Mohr?s salt $= 6$
Mohr?s salt $ \left[FeSO_{4}\cdot \left(NH_{4}\right)_{2}SO_{4}\cdot6H_{2}O\right]$
and dichromate reacts in $6 : 1$ molar ratio.
So, no. of moles of Mohr?s salt $= 6$
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