Class 11 Chemistry Notes Stocihiometry - Important Question Answers

Ex. A volume of 12.53 ml of 0.051 M SeO₂ reacts exactly with 25.5 ml of 0.1 M CrSO₄ which is oxidized to Cr³⁺ To what oxidation state was the selenium converted b the reaction.
Sol.

Ex. In basic solution CrO₄^2- ion oxidizes S₂O₃^2- ion to form Cr(OH)₄^- and SO₄^2- ions respectively. How many ml of 0.154 Na₂CrO₄ solutions are required just to react with 40 ml of 0.246 M Na₂S₂ O₃ solutions.
Sol.

Ex. What mass of N₂H₄ can be oxidized to N₂ by 24 gm of K₂CrO₄ which is reduced to
Sol.

Ex. The ion Aⁿ⁺ is oxidized to AO₃^- by MnO₄^- changing to Mn²⁺ in acid medium. Given that mole of Aⁿ⁺ required mole of MnO₄^-. What is the value of n.
Sol.

Ex. 25 ml of 0.17 M HSO₃^- in strongly acidic solution required the addition of 16.9 ml of 0.01 M MnO₄^- for its complete oxidation to SO₄^2-. In neutral solution it requires 28.6 ml. Assign oxidation no. of ‘Mn’ in each of the products.
Sol.

Ex. A given amount of Fe²⁺ is oxidized by x mol of MnO₄^- in acidic medium. Calculate mol of Cr₂O₇^2- required same amount of Fe²⁺ in acidic medium
Sol.

Ex. Calculate mol of (a) MnO₄^- and (b) Cr₂O₇^2- to oxidize 1 mol of FeC₂O₄ (ferrous oxalate) in acidic medium.
Sol.

Ex. A mixture of Na₂C₂O₄ and KHC₂O₄. H₂C₂O₄ required equal volume of 0.1 M KMnO₄ and 0.1 M NaOH separately. What is the molar ratio of Na₂C₂O₄, KHC2O4 and H₂C₂O₄ in the mixture?
Sol.

Ex. 5.5 gm of a mixture of FeSO₄. 7H₂O and Fe₂ (SO₄)₃. 9H₂O requires 5.4 ml of 0.1 N KMnO₄ solutions for complete oxidation. Calculate the no. of gm moles of hydrated ferric sulphate in the mixture?
Sol.

Share this article with your friends.

• Facebook
• Twitter
• Google+
• Pinterest
• StumbleUpon
• Dig
• LinkedIn