Question

A mixture of K2C2O4 and KHC2O4 required equal volumes of 0.1 M K2Cr2O7 for oxidation and 0.1 M NaOH for neutralization in separate titrations. The molar ratio of K2C2O4 and KHC2O4 in the mixture is :

Solution

Correct option is

2 : 1

 

Eq. mass of KHC2O4 as acid = molar mass

(one replaceable H-atom)

Eq. mass of K2C2O4 as reductant = molar mass /2

(O.N. of C changes from +3to +4)

Eq. mass of KHC2O4 as reductant = molar mass/2

Eq. mass of K2C2O4 as oxidant = molar mass/6

(O.N. of Cr changes from +6 to +3)

Moles of KHC2O4 =Equiv. of KHC2O4 as acid = 0.1 V

Moles of KHC2O4 and K2C2O4 as reductants

Moles of K2C2O4 =0.3V – 0.1V=0.2V

Ratio of moles of K2C2O4 and KHC2O4

SIMILAR QUESTIONS

Q1

20mL solution containing 0.1 M each of HCl and HNO3 required mL of 0.1 M NaOH for complete neutralization. In another experiment to 20mL of original solution, excess of AgNO3 is added and the precipitate of AgCl is filtered off. The entire filtrate along with washings required y mL of the same NaOH solution for neturalization. Then, which of the following relation is correct?

Q2

10g sample of H2O2 just decolorised 100mL of 0.1 M KMnO4 in acidic medium. % by mass of H2O in the sample is

Q3

 

KMnO4 reacts with oxalic acid as :

Hence, 50mL of 0.04 M KMnO4 is acidic medium is chemically equivalent to

Q4

Solution A and B of H2SO4 have respective molarities to be 5.0 and 1.0 In order to prepare 10L of 8 N H2SO4, what volumes of A and B solutions need be mixed?

Q5

You are given 1 L of 2 N H2SO4 and 1 L 5 N H2SO4. What will be the maximum volume of 1.5 M H2SOthat you can prepare from these two solutions?

Q6

5 mol of mixture of Mohr’s salt and Fe2(SO4)3 requires 500mL of MK2Cr2O7 for complete oxidation in acidic medium. The mole % of the Mohr’s salt in the mixture is

Q7

For the reaction : 2H3PO2 → H3PO4 +PH3 , the equilvant mass of H3PO2 is

Q8

1 mole of equimolar mixture of ferric oxalate and ferrous oxalate will require x mol of KMnO4 in acidic medium for complete oxidation. is

Q9

If g is the mass of NaHC2O4 required to neutralize 100 mL of 0.2 MNaOH and y g that required to reduce 100 mL of 0.02 KMnO4 in acidic medium, then

Q10

An equilmolar mixture of Na2C2O4 and H2C2O4 required V1L of 0.1 M KMnO4 in acidic medium for complete oxidation. The same amount of the mixture required V2L of 0.1 M NaOH for neutralization. The ratio of V1 to V2 is