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Chemistry 11 Chapter 8
Chemical Equilibrium
Test 6
1.
Which one of the folowing solution is basic?
a) Na
2
SO
4
b) FeCl
3
c) aCl
d) Na
2
CO
3
2.
Kc value has?
a) No unit
b) Both are possible
c) Has unit
d) None of these
3.
Which set of solutes will form a buffer when dissolve in water to make 1 liter of solution?
a) .4 mole of NH
3
with .2 mole of HCl
b) 0.0002 mole of HCl
c) .2 mole of NaCl with .2 mole of HCl
d) .4 mole of CH
3
COOH with .4 mole of NaCl
4.
PH of an aqueous solution is 5.5 the hydroxyl ion conc.in the solution will be?
a) 10
-8.5
b) 10
8.5
c) 8.5
d) -8.5
5.
The PH of 10
-3
mole d/m
3
of an aqueous solution of H
2
SO
4
is?
a) 3.0
b) 3.5
c) 3.7
d) 2.7
6.
Sodium benzoit and benzoic acid of equimoler mixed to form buffer if pKa is 2 what will be pH?
a) 1
b) 2
c) None of these
d) 0
7.
Why is hydroxide ion a strong base in water solution?
a) H is only the base
b) OH is the conjugate base of water
c) Strong bases dissolve completely in water and produce OH ions
d) All basese react with water to produce OH ions
8.
Which one of the following will not change the concentration of ammonia at the equilibrium?
a) Increase of pressure
b) Increase of volume
c) Addition of catalyst
d) Decrease of temprature
9.
AgCl dissolved with conc(2x10
-2
) Ksp will be?
a) None of these
b) 3.6x10
-5
c) 3.6
d) 3.6x10
-5
10.
If a buffer solution of higher PH than seven is to be made we use?
a) Weak acid and its salt with strong base
b) Weak base and its salt with strong base
c) Strong acid and strong base
d) Weak acid and weak base
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