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

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

Phenylacetic acid

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

Benazaldehyde to α-Hydroxyphenylacetic acid

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

Comment on the nature of two S−O bonds formed in SO₂ molecule. Are the two S−O bonds in this molecule equal?

How is the presence of SO₂ detected?

How is SO₂ an air pollutant?

Define the term Abnormal molar mass

How will you convert the following in not more than two steps:

Benzoic acid to Benzaldehyde

How will you convert the following in not more than two steps:

Acetophenone to Benzoic acid

Write the coordination number and oxidation state of Platinum in the complex [Pt(en)₂Cl₂].

Give reasons for the following

Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.

Give reason Aromatic diazonium salts are more stable than aliphatic diazonium salts.

Name the reagents used in the following reactions:

Account for the following:

PCl₅ is more covalent than PCl₃.

Account for the following :

SnCl₄ is more covalent than SnCl₂.

 Predict whether van’t Hoff factor, (i) is less than one or greater than one in the following: 
CH₃COOH dissolved in water 

Answer the following question.
Write a chemical reaction to test sulphur dioxide gas. write a chemical equation involved.

Which substance has conductivity in the range 10^-20 to 10^-10 ohm^-1 m^-1?

The property of a substance to offer no resistance to the flow of electricity at a particular temperature is known as ____________.

At what temperature range do most of the metals become superconductors?