Question

KMnO4 oxidizes Xn+ into,  itself changing to Mn2+ in acid solution. 2.68 × 10–3 mol of Xn+ require  mol of KMnO4. The value of n is

Solution

Correct option is

2

n’ factor of Xn+ = (5 – n); ‘n’ factor of KMnO4 = 5 Equivalents of Xn+= equivalents of KMnO4 ; (5 – n) × 2.68 ×10–3 = 5 × 1.61 ×10–3 ⇒ n = 2

SIMILAR QUESTIONS

Q1

20 mL of a solution containing Na2CO3 and NaHCO3 requires 10 mL of 0.1 N H2SO4 for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further 10 mL of 0.2 N H2SO4 is required. Molar concentration of Na2CO3 and NaHCO3 in the solution respectively are

Q2

A mixture containing 0.05 mol of K2Cr2O7 and 0.02 mol of KMnO4 was treated with excess of KI in acidic medium. The liberated iodine required 2.0 L of Na2S2O3 solution for titration. Concentration of Na2S2O3solution was

Q3

 

Calculate the molarity of KMnO4 solution, 20 mL of which is just sufficient to oxidize 0.238 g of U4+ in acidic medium according to the reaction (atomic mass of U = 238)

 

                         

Q4

50 mL of 0.04 M solution of sodium sesquicarbonate (Na2CO3.NaHCO3.2H2O) is titrated with 0.05 M HCl. V1 mL of HCl is used when phenolphthalein acts as indicator and V2 mL of HCl is used when methyl orange is the indicator in the two separate titrations. The two titration values V1and V2 differ by

Q5

0.5 g sample of oxalate salt required 30ml of 0.05 M KMnO4 in acidic medium for complete oxidation. The percent of oxalate ion in the sample is

Q6

20 mL of 0.1 M FeC2O4 solution is titration with 0.1 M KMnO4 in acidic medium. Volume of KMnO4 solution required to oxidise FeC2O4 completely is

Q7

To neutralize completely 20ml of 0.1 M phosphorous acid 40ml of KOH was required. What volume of this KOH solution will be required to neutralize 0.66 g of H3PO2?

Q8

10ml of KHC2O4 solution requires 10 ml of NaOH for complete neutralization. 10 ml of same KHC2O4 solution is oxidized by 10 ml of KMnO4 solution in acidic medium. Molarity of KMnO4 solution is

Q9

The molarity, molality and density of a solution are denoted by ω, x and yg ml–1 respectively. If molecular mass of the solute is z, then which of the following relation is correct? 

Q10

To 1 mole of pyrophosphoric acid (H4P2O7) in aqueous solution 2 mole of NaOH are added. The salt formed is