31.

Common alum is

• K₂SO₄.Al₂(SO₄)₃.24H₂O

• (NH₄)₂SO₄.FeSO₄.6H₂O

• K₂SO₄.Cr₂(SO₄)₃.24H₂O

• K₂SO₄.Fe₂(SO₄)₃.24H₂O

The general molecular formula for disaccharide is

• C₁₂H₂₂O₁₁

• C₁₀H₂₀O₁₀

• C₁₂H₂₀O₁₀

• C₁₂H₂₂O₁₀

Which one of the following proteins transports oxygen in the blood stream?

• Myoglobin

• Insulin

• Albumin

• Haemoglobin

Ethyl alcohol reacts with thionyl chloride to give

• CH₃CH₂Cl + HCl

• CH₃CH₂Cl + H₂O + SO₂

• CH₃CH₂Cl +HCl + SO₂

• CH₃CH₂Cl +SO₂ + Cl₂

Gabriel phthalimide reaction is used for the preparation of

• primary aromatic amines

• secondary amines

• primary aliphatic amines

• tertiary amines

The monomers of terylene are

• phenol and formaldehyde

• ethylene glycol and phthalic acid

• adipic acid and hexamethylenediamine

• ethylene glycol and terephthalic acid

Primary alcohols can be obtained from the reaction of R Mg X with

• CO₂

• HCHO

• CH₃CHO

• H₂O

Proteins are composed of

• $\mathrm{\alpha }$- amino acids

• carbohydrates

• vitamins

• mineral salts

Heating of rubber with sulphur is called

• vulcanisation

• galvanisation

• sulphonation

• bessemerisation

Which of the following statement is correct ?

• +I group stabilises a carbocation

• +I group stabilises a carbanion

• -I group stabilises a carbocation

• -I group stabilises a free radical