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

Write short note on the following:

Ammonolysis

Write the two applications of Henry’s law.

Identify that the following compound is insoluble, partially soluble and highly soluble in water.

phenol

Identify that the following compound is insoluble, partially soluble and highly soluble in water.

Toluene

Identify that the following compound is insoluble, partially soluble or highly soluble in water:

Formic acid

Identify that the following compound is insoluble, partially soluble or highly soluble in water:

Ethylene glycol

Identify that the following compound is insoluble, partially soluble or highly soluble in water:

Chloroform

Name an important alloy which contains some of the lanthanoid metals.

Mention uses of alloys.

Arrange the following in increasing order of their basic strength in aqueous solution:

\[\ce{CH3NH2, (CH3)3N, (CH3)2NH}\]

(b) Rate constant ‘k’ of a reaction varies with temperature ‘T’ according to the equation:

`logk=logA-E_a/2.303R(1/T)`

Where E_a is the activation energy. When a graph is plotted for `logk Vs. 1/T` a straight line with a slope of −4250 K is obtained. Calculate ‘E_a’ for the reaction.(R = 8.314 JK⁻¹ mol⁻¹)

Draw the structures of the following molecules: (HPO₃)₃

How would you account for the following:

The chemistry of actinoids is more complicated as compared to lanthanoids.

Give reasons for the following: Butan-1-ol has a higher boiling point than diethyl ether.

Arrange the following:

Aniline, p-nitroaniline, p-methylaniline - in the increasing order of their basic strength

The rate constant of a first order reaction increases from 4 × 10⁻² to 8 × 10⁻² when the temperature changes from 27°C to 37°C. Calculate the energy of activation (Ea). (log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

The rate constant for the first-order decomposition of H₂O₂ is given by the following equation:

`logk=14.2-(1.0xx10^4)/TK`

Calculate E_a for this reaction and rate constant k if its half-life period be 200 minutes.

(Given: R = 8.314 JK^–1 mol^–1)

Give a reason for the following: 

Actinoids show irregularities in their electronic configurations.

What is the role of t-butyl peroxide in the polymerization of ethene?

Write the mechanism of free radical polymerization of ethene.