Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Zinc carbonate is precipitated from zinc sulphate solution by the addition of ___________.

Which two of the following salts are used for preparing iodized salt?

(i) KIO₃

(ii) KI

(iii) I₂

(iv) HI

Among the following the one which reacts most readily with ethanol is:

Methanol and ethanol are miscible in water due to ____________.

If ethanol dissolves in water, then which of the following would be observed:

Which of the following is correct?

Wood spirit is known as acetone:

The number of tripeptides formed by 3 different amino acids.

Which amino acids are chiral?

Among the following a chiral amino acid is:

Assertion: Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent.

Reason: Oxidising agent oxidises I₂ into HI.

A unit cell of NaCl has 4 formula units. Its edge length is 0.50 nm. Calculate the density if molar mass of NaCl = 58.5 g/mol.

Match the following:

Which of the following is the best matched options?

In a reaction, catalyst changes:

(i) physically

(ii) qualitatively

(iii) chemically

(iv) quantitatively

Zone refining is based on the principle that ______.

Electrolytic refining is used to purify which of the following metals?

In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?

(i) Heating with stream of carbon monoxide.

(ii) Heating with iodine.

(iii) Liquation.

(iv) Distillation.

In the extraction of chlorine from brine:

(i) ∆G^Θ for the overall reaction is negative.

(ii) ∆G^Θ for the overall reaction is positive.

(iii) E^Θ for overall reaction has negative value.

(iv) E^Θ for overall reaction has positive value.

Why is an external emf of more than 2.2 V required for the extraction of \[\ce{Cl2}\] from brine?

Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.