Chemistry Test ...

A very thin copper plate is electro-plated with gold using gold chloride in HCl. The current was passed for 20 minutes and the increase in the weight of the plate was found to be 2 gram [Au = 197]. The current passed was

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

Given :

(i) MnO₄^- + 8H⁺ + 5e^- → Mn²⁺ + 4H₂O    E⁰ + x₁ V

(ii) MnO₂ + 4H⁺ + 2e^- → Mn²⁺ + 2H₂O    E⁰ + x₂ V

Find E⁰ for the following reaction : 

MnO₄^- + 4H⁺ + 3e^- → MnO₂ + 2H₂O

The specific conductivity of an aqueous solution of a weak monoprotic acid is 0.00033 ohm^–1cm^–1 at a concentration 0.02 M. If at this concentration the degree of dissociation is 0.043, then calculate the value of 

Which of the following ions will be most effective in coagulating the As₂S₃ sol :

What are the units of the rate constant for this reaction ?

In a gaseous phase reaction.  The increase in pressure from 100 mm to 110 mm is observed in 5 minute. The rate of disappearance of A₂ in mm min^-1 is :

In a certain reaction, 10% of the reactant decomposes in one hour, 20 % in two hours, 30% in three hours and so on. The dimensions of the rate constant is :

Which of the following is wrong :