Basic Concepts - 10
1.
Which of the following has highest percentage of nitrogen
a) (NH)
2
SO
4
b) NH
4
H
2
PO
4
c) (NH
4
)
3
PO
4
d) (NH
4
)
2
HPO
4
2.
0.1 mole of Na
3
PO
4
completely dissociates in water to produce Na
+
a) 1.806 X 10
22
b) 6.02 X 10
23
c) 6.02 X 10
22
d) 1.806 X 10
23
3.
Efficiency of a chemical reaction can be checked by calculating
a) amount of limiting reactant
b) amount of reactant in excess
c) amount of reactant left unused.
d) amount of product formed.
4.
A limiting reactant is one.
a) Which is present in least amount.
b) Which produces maximum number of moles of product
c) which produces minimum number of moles of product
d) does not effect the amount of product.
5.
Stoichiometry is the branch of chemistry which deals with study of quantitative relationship among various.
a) reactants and products.
b) all of above.
c) reactants.
d) products.
6.
500 cm
3
of H
2
gas at STP contains atoms of hydrogen.
a) 3.01 x 10
22
b) 6.02 X 10
22
c) 2.68 X 10
22
d) 1.34 X 10
22
7.
Largest number of H
+
are produced by complete ionization of.
a) all above
b) 0.0050 mole of H
2
SO
4
c) 0.010 mole of HCl
d) 0.00334 moles of H
3
PO
4
8.
The avagadro’s number is
a) 6.02 X 10
24
b) 6.02 X 10
23
c) 6.02 X 10
-23
d) 6.02 x 10
-24
9.
The largest number of H
+
are produced by complete ionization of.
a) 0.1002 moles of HCl
b) 0.0334 moles of H
3
PO
4
c) All of the above.
d) 0.051 moles of H
2
SO
4
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