Equivalent based questions (valency factors)

[Dhamnekar Win,odd]

a) What volume of 0.2 M K₂Cr₂O₇ is required to oxidize 50 ml of 0.3 M Na₂C₂O₄ in acidic medium?

b)How many moles of KMnO₄ will be required to react completely with 1 mole of K₂C₂O₄ in acidic medium?

c) What volume of 0.1 M KMnO₄ is required to oxidize 100 ml of 0.3M FeC₂O₄ (Ferrous Oxalate) in acidic medium?

d) How many moles of FeC₂O₄ is required to reduce 2 mol of KMnO₄ in acidic medium?

e)How many moles of K₂Cr₂O₇ are required to react completely with 2.5 moles of Cu₂S in acidic medium?

 

My attempt to answer all these questions:


a) 75 mL of 0.2M K₂Cr₂O₇ is required to oxidize 50 mL of 03M Na₂C₂O₄ in acidic medium.

b) 0.4 mole of KMnO₄ is required to react completely with 1 mole of K₂C₂O₄ in acidic medium.

c) 120 mL of 0.1M KMnO₄ is required to oxidize 100 mL of 0.3M FeC₂O₄ in acidic medium.

d) 5 moles of FeC₂O₄ are required to reduce 2 moles of KMnO₄ in acidic medium.

e) 5 moles of K₂Cr₂O₇ are required to react completely with 2.5 moles of Cu₂S in acidic medium.

Are these above answers correct ?
Let me know. Thanks.

[Dhamnekar Win,odd]

Are the following rectified answers to a, b, c correct?

[Dhamnekar Win,odd]

[Dhamnekar Win,odd]

22 hours ago, Dhamnekar Win,odd said:

 Hello,

Both of these above answers are wrong. So ignore the contents of this post. 

[Dhamnekar Win,odd]

Answer to d: 5 moles of Ferrous oxalate FeC₂O₄  are required to reduce 2 moles of Potassium Permanganate in acidic medium.

Answer to e:

Redox equation is  [math] K_2Cr_2O_7 + 3Cu_2S + 14H^+ \rightarrow  6Cu^{2+} + 3S + 7 H_2O + 2K^+ + 2Cr [/math]
From the aforesaid equation, we can say that [math] \frac56 [/math] moles of   K₂Cr₂O₇ is required to react completely with 2.5 moles of  [math]Cu_2S[/math] in acidic medium.

Edited September 16, 2021 by Dhamnekar Win,odd