The vapour pressure of acetone at 20^oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20^oC, its vapour pressure was 183 torr. The molar mass (g mol^-1 ) of the substance is:

• 32

• 64

• 128

• 128

Two Faraday of electricity is passed through a solution of CuSO₄. The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu)

• 0 g

• 63.5 g

• 2 g

• 2 g

Higher order (>3) reactions are rare due to:

• the increase in entropy and activation energy as more molecules are involved.

• shifting of equilibrium towards reactants due to elastic collisions

• loss of active species on a collision

• loss of active species on a collision

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:

• 18 mg

• 36 mg

• 42 mg

• 42 mg

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

• CO and CO₂ are produced in this process

• Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

• Al³⁺ is reduced at the cathode to form Al

• Al³⁺ is reduced at the cathode to form Al

Which among the following is the most reactive?

• Cl₂

• Br₂

• I₂

• I₂

Match the catalysis to the correct processes.

• (A)- (iii), (B)-(ii), (C)-iv, (D)- (i)

• (A) - (ii), (B) - (i), (C) -(iv), (D) - (iii)

• (A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)

• (A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)

Which one has the highest boiling point?

• He

• Ne

• Kr

• Kr

The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH₃) (NH₂OH)]⁺ is (py = pyridine)

• 2

• 3

• 4

• 4

20.

The Colour of KMnO₄ is due to 

• M → L charge transfer transition

• d-d transition

• L →M charge transfer transition

• L →M charge transfer transition