31.

1.00 g of a non- electrolyte solute (molar mass 250 g mol^-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K Kg mol^-1, the freezing point of benzene will be lowered  by:

• 0.4 K

• 0.3 K

• 0.5 K

• 0.5 K

A solution of acetone in ethanol:

• shows a negative deviation from Raoult's law

• shows a positive deviation from Raoult's law

• behave likea near ideal solution

• behave likea near ideal solution

A hypothetical electrochemical cell is shown below
A^- | A⁺ (xM)|| B⁺ (yM)|B⁺

The emf measured is +0.20 V. The cell reaction is:

• A⁺ + B  →  A + B⁺

• A⁺ + e^-  →  A ; B⁺ + e^-  → B^-

• the cell reaction cannot be predicted

• the cell reaction cannot be predicted

During osmosis, flow of water through a semi-permeable membrane is: 

• from a solution having higher concentration only

• from both sides of a semi-permeable membrane with equal flow rates

• from both sides of a semi-permeable membrane with unequal flow rates

• from both sides of a semi-permeable membrane with unequal flow rates

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

• In NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction

• In NH₃ the atomic dipole  and bond dipole are in opposite directions

• In  NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

• In  NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

Which of the following is the most basic oxide?

• Al₂O₃

• Sb₂O₃

• Bi₂O₃

• Bi₂O₃

Which of the following species has a linear shape?

• NO₂-

• SO₂

• NO₂⁺

• NO₂⁺

The number of unpaired electrons in a paramagnetic  diatomic molecule of an element with atomic number 6 is:

• 2

• 3

• 4

• 4

Which one of the following orders is not in accordance with the property stated against it? 

• F₂ > Cl₂ > Br₂ > I₂ : Oxidising power

• HI> HBr> HCl >HF: Acidic property in water

• F₂ > Cl₂ > Br₂ > I₂: Electrongeativity

• F₂ > Cl₂ > Br₂ > I₂: Electrongeativity

In a set of reactions, propionic acid yielded a compound D.


The structure of D would be:

• CH₃CH₂CH₂NH₂

• CH₃CH₂CONH₂

• CH₃CH₂NHCH₃

• CH₃CH₂NHCH₃