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

Match the compounds given in Column I with the items given in Column II.

A colourless substance ‘A’ \[\ce{(C6H7N)}\] is sparingly soluble in water and gives a water soluble compound ‘B’ on treating with mineral acid. On reacting with \[\ce{CHCl3}\] and alcoholic potash ‘A’ produces an obnoxious smell due to the formation of compound ‘C’. Reaction of ‘A’ with benzenesulphonyl chloride gives compound ‘D’ which is soluble in alkali. With \[\ce{NaNO2}\] and \[\ce{HCl}\], ‘A’ forms compound ‘E’ which reacts with phenol in alkaline medium to give an orange dye ‘F’. Identify compounds ‘A’ to ‘F’.

Predict the reagent or the product in the following reaction sequence.

Discuss briefly, giving an example of the role of coordination compounds in biological systems.

Account for the following:

Ti(IV) is more stable than the Ti (II) or Ti(III).

What is meant by the chelate effect? Give an example.

Draw the structure of the following compound.

3-Bromo-4-phenylpentanoic acid

What is meant by the chelate effect? Give an example.

Draw the structure of the following compound.

3-Bromo-4-phenylpentanoic acid

What is meant by the chelate effect? Give an example.

What is meant by the chelate effect? Give an example.

Draw the structure of the given compound.

3-Bromo-4-phenylpentanoic acid

What is meant by the chelate effect? Give an example.

Discuss briefly, giving an example of the role of coordination compounds in analytical chemistry.

Discuss briefly, giving an example of the role of coordination compounds in extraction/metallurgy of metals.

Draw the structure of the following compound.

3-Bromo-4-phenylpentanoic acid

Define van’t Hoff factor.

What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?

What happens when: SO₂ gas is passed through an aqueous solution Fe⁺³ salt?