Friday, August 3, 2012

Tests of Chapter #01



        TEST #01


Class: XI                                                     Subjects: Chemistry
Chapter: 01                                                        Time: 30 min

Q.1a)  Atomic mass of S = 32 a.m.u.; Calculate                                     [ 3]       
(i)                Number of mole in 640g of S
(ii)             Mass of 3.01x 1023 atoms of S
(iii)           Number of atoms in 4.6g of S
b)  At high temperature sulphur (S) combines with iron (Fe) to form
        brown black  iron sulphide (FeS).        Fe    +    S   →    FeS       [4]
         In one experiment 100g  of Fe are allowed to react 86.7g of sulphur;      
          which of them  is limiting reactant;  Calculate the amount of FeS   
           btained.
     c) How  do you differentiate  between molecular formula and empirical
              formula                                                                                  [2]   
    d)   How many molecules of water are present in 3.2g  of SO2             [1]      
    e)   Calculate the mass of KCl and oxygen. Find also the volume  of the              
        oxygen at  S.T.P. that may be obtain by the decomposition of 51.3g of   
            KClO3 of heating in      presence of catalyst.                         [5]    
2 KClO3                           2 KCl  +  3O2


Prepared by
Syed Fayyaz hussain


   






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