Electro+solutions+kinetics + organic

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult's law?

• Methanol and acetone

• Chloroform and acetone

• nitric acid and water

• phenol and aniline

For a certain reaction of order 'n' the time of half change t_1/2=(2-√2)C_o^1/2/K , where K is the rate constant and C_o is initial concentration. The value of n is:

• 1

• 2

• 0

• 0.5

Hydrogen electrode are immersed in two solutions pf pH= 3 and pH= 8 respectively linked through a salt bridge. The operative emf of the working cell would be:

• 0.327 V

• 0.208 V

• 0.295 V

• 0.250 V

An unripe mango Placed in a concentrated salt solution to prepare pickle, shrivels because:

• it gains water due to osmosis

• it gains water due to reverse osmosis

• it loses water due to reverse osmosis

• it loses water due to osmosis

For an endothermic reaction where ΔH represents the enthalpy of the reaction in KJ/mol, the minimum value for the energy of activation will be:

• less than ΔH

• ZERO

• more than ΔH

• equal to ΔH

Given:

• Mn²⁺

• MnO₄^-

• Cl^-

• Cr³⁺

For a reaction in which the activation energies of forward and reverse reactions are equal?

• ΔH = 0

• ΔS = 0

• The order is zero

• There is no catalyst

A current is passed through two voltmeters connected in series. The first voltmeter contains XSO₄(aq) while second voltmeters contains Y₂SO₄(aq). The relative atomic masses of X and Y are in the ratio 2;1. The ratio of the mass of X liberated to the mass of Y liberated is;

• 1:1

• 1:2

• 2:1

• none of these

The amount of ice that will seperate out on cooling a solution containing 50gm of ethylene glycol in 200gm water to -9.3⁰C is: (K_f^' = 1.86 K molality^-1)

• 38.71 gm

• 38.71 mg

• 42 gm

• 42 mg

Half life of a first order reaction is 10 minutes. What percentage of reaction will be complete in 100 minutes?

• 25%

• 50%

• 99.99%

• 75%