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Chemistry Test ...

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  • Question 1
    4 / -1

    Volume occupied by one molecule of water (density = 1 g/cm3) is :

  • Question 2
    4 / -1

    Liquid benzene (C6H6) burns in oxygen according to the equation,

    2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l)

    How many litres of O2 at STP are needed to complete the combustion of 39 g of liquid benzene? (Molecular weight of O2 = 32, C6H6 = 78)

  • Question 3
    4 / -1

    The solubility of a substance 'X' in pure ethanol is 0.1 gm/L and in water is 0.01 gm/L. To dissolve 11 gm of dry 'X'', 20 mL of fresh 50%5 (V/V) ethanol solution is added. How many times do we need to add this ethanol solution to dissolve 'X'?

  • Question 4
    4 / -1

    In Haber's process, 30 litres of dihydrogen and 30 litres of dinitrogen were taken for the reaction, which yielded only 50% of the expected product. What will be the composition of the gaseous mixture under the aforesaid condition in the end?

  • Question 5
    4 / -1

    The molecular weight of glucose is 180. What is the molarity of a solution which contains 18 g/L of glucose?

  • Question 6
    4 / -1

    For the reaction represented by the equation, CX4 + 2O2 → CO2 + 2X2O, 9.0 g of CX4 completely reacts with 1.74 g of oxygen. The approximate molar mass of X will be:

  • Question 7
    4 / -1

    The number of atoms present in a 0.635 g of Cu piece will be

  • Question 8
    4 / -1

    Which of the following has the smallest number of molecules?

  • Question 9
    4 / -1

    In a solution of 7.8 g benzene (C6H6) and 46.0 g toluene (C6H5CH3), the mole fraction of benzene is

  • Question 10
    4 / -1

    The amount of anhydrous Na2CO3 present in 250 mL of 0.25 M solution is

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