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
nice work sir
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