Chemistry Question Bank

Ozonized oxygen is a mixture of

Which of the following statements is correct?

Ozone is an extremely powerful oxidizing agent. It is

At room temperature, O₃ is absorbed by

The gases absorbed by alkaline pyrogallol and oil of cinnamon are respectively

In the presence of water, sulphur is oxidized by ozone to give

A green coloured solution of a salt changes its colour to light pink on passing ozone through it. Which of the following species represent pink and green colour respectively ?

O₃ cannot oxidise:

Which of the following is/are correct?

In the cyclo-S₈ molecule of rhombic sulphur, all the S—S bond lengths and all the S—S—S bond angles are respectively (approximate values)

H₂S turns an acidified K₂Cr₂O₇ solution

H₂S turns an acidified KMnO₄ solution

Which of the following compounds is thermodynamically unstable?

H₂S is less stable than H₂O because

Sulphur dioxide reacts with chlorine in the presence of charcoal (which acts as a catalyst) to give

Which of the following gases may act both as an oxidizing and a reducing agent?

Dehydration of concentrated H₂SO₄ in the presence of P₄O₁₀ produces

H₂SO₄ is manufactured from SO₂(g) by the

Which of the following ions does not have an S—S linkage?

When SO₂ gas is passed into an acidified solution of K₂Cr₂O₇, the oxidation state of chromium changes

Standard sodium thiosulphate solution is used in the estimation of iodine present in a solution. The equivalent weight of sodium thiosulphate which is required to make the standard solution is

A gas that cannot be collected over water is

Which of the following elements can have both positive and negative oxidation states?

Which of the following halogens has only one oxidation state of –1 in an aqueous solution?

Which one among the following is the most powerful oxidizing agent?