Chemistry MCQs for NEET — Practice Questions with Answers

When SO₂ is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in oxidation number of chromium is:

In which transfer of five electrons takes place?

In the reaction;

2Ag + 2H₂SO₄ $\to$Ag₂SO₄ + 2H₂O + SO₂,H₂SO₄ acts as:

Which of the following shows highest ox. no. in combined state?

In the preparation of chlorine from HCl; MnO₂ acts as:

Which combination is odd with respect to oxidation numbers of S, Cr, N and H respectively:\

In which reaction H₂O₂ acts as a reducing agent?

Excess of KI reacts with CuSO₄ solution and then Na₂S₂O₃ solution is added to it. Which of the statement is incorrect in this reaction?

In the equation,

N${\mathrm{O}}_2^{-}$ +  H₂O $\to$N${\mathrm{O}}_3^{-}$ + 2H⁺ + ne^-

n stands for:

Amount of oxalic acid present in a solution can be determined by its titration with KMnO₄ solution in the presence of H₂SO₄. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl: