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

Given reasons: C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH₃–Cl.

Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically active.

Which would undergo S_N2 reaction faster in the following pair and why ?

What is meant by positive deviations from Raoult's law? Give an example. What is the sign of ∆_mixH for positive deviation?

Define azeotropes. 

Draw the geometrical isomers of complex [Pt(NH₃)₂Cl₂].

Write the equation involved in the acetylation of Salicylic acid.

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?

Write the names and structure of the monomers of the following polymers: 

Nylon-6, 6

Write the structure of the major product in each of the following reaction :

How will you distinguish between the following pair of terms?

Tetrahedral and octahedral voids

What type of isomerism is exhibited by the complex [Co(en)₃]³⁺?

(en = ethane-1,2-diamine)

What type of deviation is shown by a mixture of ethanol and acetone? Give reason.

Which of the following is a fibre? Nylon, neoprene, PVC

Define the following term:

Anomers 

Write the structures of A, B and C in the following:

If the radius of the octahedral void is r and the radius of the atoms in close packing is R, derive the relation between r and R.

The vapour pressures of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if the total vapour pressure is 600 mm Hg. Also, find the composition of the vapour phase.

Vapour pressure of pure water at 298 K is 23.8 mm Hg. 50 g of urea (NH₂CONH₂) is dissolved in 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.

An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?