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

Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. Justify your answer.

Analysis shows that nickel oxide has the formula Ni_0.98O_1.00. What fractions of nickel exist as Ni²⁺ and Ni³⁺ ions?

Explain the following with suitable examples:

Paramagnetism

Explain the following with suitable examples:

Ferrimagnetism

Explain the following with suitable examples: 

Antiferromagnetism

The two strands in DNA are not identical but are complementary. Explain.

Give two examples to show the anomalous behaviour of fluorine.

Write two uses of ClO₂.

Why are halogens coloured?

Write the reactions of F₂ with water.

With what neutral molecule is ClO⁻ isoelectronic? Is that molecule a Lewis base?

Arrange the following in the order of property indicated for the given set:

HF, HCl, HBr, HI - increasing acid strength.

Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

Complete chemical reactions are:Cl₂ + H₂O →

Complete the following equations:

 KMnO₄ 

Arrange the following in the decreasing order of their reducing character :

HF, HCl, HBr, HI

Based on the type of particles of dispersed phase, give one example each of associated colloid and multimolecular colloid.

What is the difference between Nucleotide and Nucleoside? 

 Cl2 acts as a bleaching agent.