Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

The correct order of acid strength is:

On addition to conc. \[\ce{H2SO4}\] to a chloride salt, colourless fumes are evolved but in the case of an iodide salt, violet flames come out. This is because ______.

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have the highest bond dissociation enthalpy?

On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with 3 mol of hydrogen (H₂) in the presence of a catalyst gives another gas (C) which is basic in nature. Gas C on further oxidation in moist condition gives a compound (D) which is a part of acid rain. Identify compounds (A) to (D) and also give necessary equations of all the steps involved.

Account for the following:

Fluorine forms only one oxoacid HOF.

Draw the structures of the following:
(1) HClO₄
(2) H₃PO₃

Draw the structures of the HClO₃.

Account for the following :

HClO₄ is a stronger acid than HClO.

The increasing order of reducing power of the halogen acids is:

Which one of the following order is correct for the bond dissociation enthalpy of halogen molecule?

Assertion: HI cannot be prepared by the reaction of KI with concentrated H₂SO₄.

Reason: HI has the lowest H-X bond strength among halogen acids.

A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When excess of this gas reacts with \[\ce{NH3}\] an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from ______.

Explain why the stability of oxoacids of chlorine increases in the order given below:

\[\ce{HClO < HClO2 < HClO3 < HClO4}\]

Assertion: \[\ce{HI}\] cannot be prepared by the reaction of KI with concentrated \[\ce{H2SO4}\]

Reason: \[\ce{HI}\] has lowest \[\ce{H - X}\] bond strength among halogen acids.

Draw the structures of the following molecules: BrF₃

ICl is more reactive than I₂.

Account for the following: Interhalogens are more reactive than pure halogens.

Draw the structure of BrF₅

Draw the structures of the following : ClF₃

Why is ICl more reactive than I₂?