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Chemistry Test 103

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Chemistry Test 103
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The combustion enthalpy of carbon, hydrogen and methane are –393.5; –284.8 and –890.4 kJ/mole respectively at 25°C. The value of standard formation enthalpies of methane at that temperature is :-

    Solution

    C + 2H2 → CH4

    = – 393.5 + 2 (–284.8) – (–890.4)

    = – 72.7 kJ/mole

     

  • Question 2
    4 / -1

    The extent of adsorption of a gas on a solid depends on :- 

  • Question 3
    4 / -1

    Solution of methylene blue dye becomes colourless if mixed with:-

    Solution

    Chorcoal will adsorbe methylene blue

     

  • Question 4
    4 / -1

    Which of the following statement is not applicable to chemisorption?

    Solution

    Chemisorption first increases and then decreases with temperature.

     

  • Question 5
    4 / -1

    Medicines are more effective, if they are used in :

  • Question 6
    4 / -1

    Fog is a colloidal solution of :-

  • Question 7
    4 / -1

    The stability of lyophilic colloids is due to :

  • Question 8
    4 / -1

    Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration ?

    Solution

    In gold sol, colloidal particles are negatively charged and Al+3 ion will coagulate them quickly and with least concentration.

     

  • Question 9
    4 / -1

    Colloidal solution of starch is an example of :-

  • Question 10
    4 / -1

    Which of the following is less than zero during Adsorption ?

    Solution

    Since adsorption is a spontaneous process
    So ΔG < 0 ; Exothermic ΔH < 0, entropy of system↓

     

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