21.

An oxide of the element contains 20% O₂ by weight. Calculate the equivalent weight of the element.

• 8

• 16

• 32

• 12

Maximum number of molecules of CH₃I that can react with a molecule of CH₃NH₂ are

• 3

• 4

• 2

• 1

The relation between $∆$H and $∆$U is

• $∆\mathrm{H} = ∆\mathrm{U} + \mathrm{RT}$

• $∆\mathrm{H} = ∆\mathrm{U} - ∆\mathrm{nRT}$

• $∆\mathrm{H} = ∆\mathrm{U} + ∆\mathrm{nRT}$

• $∆\mathrm{U} = ∆\mathrm{H} + ∆\mathrm{nRT}$

In which of the following process, maximum increase in entropy is observed?

• Melting of ice

• Sublimation of napthalene

• Condenstaion of water

• Dissolution of salt in water

Considering the reaction C (s) + O₂ (g) → CO₂ (g) + 393.5 kJ the signs of $∆$H, $∆$S and $∆$G respectively are

• +, -, -

• -, +, +

• -, -, -

• -, +, -

+I effect is shown by

• -CH₃

• -Br

• -Cl

• -NO₂

Benzene reacts with chlorine in sunlight to give a final product

• CCl₄

• C₆H₆Cl₆

• C₆Cl₆

• C₆H₅Cl

The general formula of a cycloalkane is

• C_nH_n

• C_nH_2n

• C_nH_2n-2

• C_nH_{2n + 2}

How many chiral carbon atoms are present in 2, 3, 4-trichloropentane?

• 4

• 1

• 2

• 3

Which one of the following shows functional isomerism?

• C₂H₄

• C₃H₆

• C₂H₅OH

• CH₂Cl₂