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Chemistry Test 190
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Chemistry Test 190
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  • Question 1/10
    4 / -1

    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

    Solutions

     

  • Question 2/10
    4 / -1

    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 :

    Solutions

     

  • Question 3/10
    4 / -1

    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

    Solutions

     

  • Question 4/10
    4 / -1

    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 

    Solutions

     

  • Question 5/10
    4 / -1

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

    Solutions

    According Hardy-Schulze rule.

     

  • Question 6/10
    4 / -1

    Solutions

    A acts as cathode and B acts as anode because reduction potential of A is more.

    Anode is B   ⇒ is negative electrode.

    ⇒ electrons flow from B to A.

    ⇒ e.m.f. = (1.33 – 0.77) V 

     

  • Question 7/10
    4 / -1

    Directions For Questions

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

    Solutions

    Order of reaction is 2 therefore unit of K is mole-1 Ls-1.

     

  • Question 8/10
    4 / -1

    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 :

    Solutions

     

  • Question 9/10
    4 / -1

    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 :

    Solutions

    It is a zero order reaction therefore units of K is mol L-1 s-1.

     

  • Question 10/10
    4 / -1

    Which of the following is wrong :

    Solutions

    The correct statement is : Enthalpy (numerical value) of physisorption is lower than that of chemisorption.

     

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