PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions

Explain the following with suitable examples:

Ferrimagnetism

Explain the following with suitable examples: 

Antiferromagnetism

How are vitamins classified? Name the vitamin responsible for the coagulation of blood.

Why are vitamin A and vitamin C essential to us? Give their important sources.

Give plausible explanation for the following:

During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.

Complete the synthesis by giving missing starting material, reagent or product.

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.

Predict the products of the following reactions :

In terms of band theory, what is the difference between a conductor and an insulator?

In terms of band theory, what is the difference between a conductor and a semiconductor?

How will you bring about the following conversion in not more than two steps?

Benzoic acid to Benzaldehyde

Describe the following:

Decarboxylation

Sea is the greatest source of some halogens. Comment.

What happens when 

(i) PCl₅ is heated ? Write the reactions involved.

Account for the following : Cl – CH₂COOH is a stronger acid than CH₃COOH.