solutions+electro+kinetics

Which of the following behavior is true about the ideal binary liquid solution of liquids 'A' and 'B', If P⁰_A<P⁰_B?

• Plot of P_total vs X_A is non-linear

• Plot of P_total vs X_B is linear with +ve slope

• Plot of P_total vs X_B is linear with slope = 0

• Plot of P_total vs X_B is linear with -ve slope

For an ideal solution containing two liquid components A and B, the Gibb's free energy of mixing is minimum, when the molar ratio of the liquids is

• 1:1

• 1:2

• 1:1000

• 1:10

Dry air was passed successively through a solution of 5gm of a solute in 80 gm of water and then through pure water. The loss in mass of solution was 2.5gm and that of pure solvent was 0.04gm. What is the molecular mass of the solute?

• 70.3

• 71.43

• 14.28

• 14.06

Due to osmosis, the volume of concentrated solution

• decreases slowly

• increases slowly

• increases rapidly

• decreases rapidly

• same for both

• unpredictable

An aqueous solution of 10% NaCl ( consider ideal behaviour of the solution) is cooled. It will allow some.

• NaCl to crystallize

• water to freeze

• water to solidify along with some NaCl

• Precipitation of NaCl

Answer explanation

only solvent freezes

Four colorless salt solutions are placed are placed in each. Which solution finally turns blue?

• AgNO₃

• Pb(NO₃)₂

• Zn(NO₃)₂

• Cd(NO₃)₂

Answer explanation

Cu wll reduce Ag+ and itself becomes Cu2+.

Use of lithium metal as an electrode in high energy density batteries is due to

• lithium is the lightest element

• lithium has the highest oxidation potential

• lithium is quite reactive

• lithium does not corrode easily

Faraday's law of electrolysis fails when

• temperature increased

• inert electrodes are used

• a mixture of electrolytes are used

• none of these

copper can be deposited from acidified copper sulphate and alkaline cuprous cyanide. If the same current is passed for a definite time.

• The amount of copper deposited from acidic copper sulphate will be higher

• the amount of copper deposited from alkaline cuprous cyanide will be higher

• the same amount of copper will be deposited

• copper will not deposit in either case