Questions Based on Some Basic Concepts

Practice Question
 
1. Which of the following method/methods of expressing concentrations is/are independent of temperature?
    (a)  Mole fraction   (b) Molarity   (c)  Normality    (d)  Molality

2.  80 g of oxygen contain as many atoms as in
    (a)  10 g of hydrogen  (b) 5 g of hydrogen   (c)  80 g of hydrogen    (d)  1 g of hydrogen

3.  What is the molality of pure water?
    (a)  1    (b)   18   (c)  55.5    (d) None of these

4.  Which of the following methods of expressing concentration varies with temperature?
    (a)  Molality    (b)  Weight per cent  (c)  Normality     (d)  Molarity

5. The following substances are present in different containers   
     (i)     One gram atom of nitrogen   
    (ii)     One mole of calcium
    (iii)    One atom of silver   
    (iv)    One mole of oxygen molecules
    (v)     1023 atoms of carbon and   
    (vi)     One gram of iron
    The correct order of increasing masses (in grams) is/are:
    (a)    (iii) < (vi) < (i) < (v)    (b)    (iii) < (vi) < (iv) < (ii)
    (c)    (vi) < (v) < (i) < (iv)    (d)    (iii) < (ii) < (v) < (iv)

6.  In MgSO4 (at. mass : Mg = 24, S = 32, O = 16), the mass percentage of
    (a)    Mg = 80%    (b)    Mg = 20%
    (c)    S = 26.7%    (d)    S = 53.3%