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

What type of semiconductor is obtained when silicon is doped with boron? 

Give reasons for the following observations: Addition of alum purifies the water

Write the conditions to maximize the yield of H₂SO₄ by contact process.

What are emulsions?

What are the different types of emulsions? Give one example of each type.

Complete the following equations: CaF₂+H₂SO₄ →

What are the dispersed phase and dispersion medium in milk?

Complete the following equations: C + conc. H₂SO₄ →

Draw the structure of the following:

H₂SO₄

How do emulsifires stabilise emulsion? Name two emulsifiers.

Action of soap is due to emulsification and micelle formation. Comment.

Give four uses of emulsions.

What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?

What are the different types of RNA found in the cell?

Write the important functional differences between DNA and RNA.

Mention three areas in which H₂SO₄ plays an important role.

Why is `K_(a_2) "<<" K_(a_1)` for `H_2SO_4` in water?

Describe the manufacture of H₂SO₄ by contact process?

Write balanced equations for NaCl is heated with sulphuric acid in the presence of MnO₂

Give reasons : Silicon on doping with Phosphorous forms n-type semiconductor.