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

Define the following terms : Molarity

Write the principle behind the froth floatation process. What is the role of collectors in this process?

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

The decomposition of NH₃ on platinum surface is zero order reaction. What are the rates of production of N₂ and H₂ if k = 2.5 × 10⁻⁴ mol⁻¹ L s⁻¹?

The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:

What is an adsorption isotherm?

Describe Freundlich adsorption isotherm.

How is activation of adsorbent achieved?

What is the role of depressant in froth floatation process?

List various types of isomerism possible for coordination compounds, giving an example of each.

Arrange the following polymers in increasing order of their intermolecular forces.

(i) Nylon 6, 6, Buna-S, Polythene.

(ii) Nylon 6, Neoprene, Polyvinyl chloride.

In which classes, the polymers are classified on the basis of molecular forces?

Define thermoplastics with two examples of each.

Define thermosetting polymers with two examples of them.

Write a short note on the following:

Hoffmann’s bromamide reaction

Accomplish the following conversion:

Nitrobenzene to benzoic acid

Accomplish the following conversion:

Benzyl chloride to 2-phenylethanamine

Accomplish the following conversion:

Benzamide to toluene

Give the structure of A, B and C in the following reaction:

\[\ce{CH3CH2I ->[NaCN] A ->[OH-][Partial hydrolysis] B ->[NaOH + Br2] C}\]

Give the structure of A, B and C in the following reaction:

\[\ce{C6H5N2Cl ->[CuCN] A ->[H2O/H+] B ->[NH3][\Delta] C}\]