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1.

200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158 cm3 . Estimate the percentage of oxygen in the air.

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A.

31%

B.

27%

C.

21%

D.

19%


2.
30cm3 of oxygen at 10 atmosphere pressures is placed in a 20dm 3 container. Calculate the new pressure if temperature is kept constant.
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A.
6.7 atm
B.
15.0 atm
C.
60
D.
66

3.
Bond dissociation energy of 500 KJ mol-1 may be assigned to
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A.
ionic bonding
B.
covalent bonding
C.
hydrogen bonding
D.
metallic bonding
E.
van-der-waals bonding.

4.
A mixture of iron and sulphur can be separated by dissolving the mixture in __
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A.
steam
B.
dilute hydrochloric acid
C.
dilute sodium hydroxide
D.
benzene

5.
A mixture of sand, ammonium chloride and sodium chloride is best separated by __
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A.
sublimation followed by addition of water and filtration
B.
sublimation followed by addition of water and evaporation
C.
addition of water followed by filtration and sublimation
D.
addition of water followed by crystallization and sublimation

6.
A pure solid usually melts __
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A.
over a wide range of temperature
B.
over a narrow range of temperature
C.
at a lower temperature than the impure one
D.
at the same temperature as the impure one

7.
A small quantity of solid ammonium chloride was heated gently in a test tube; the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone __
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A.
distillation
B.
sublimation
C.
precipitation
D.
evaporation

A.
trigonal
B.
planar
C.
tetrahedral
D.
octahedral
E.
linear.

9.
Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5. The relative abundance of the isotope of mass number 37 is ___
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A.
20
B.
25
C.
50
D.
75

10.
Elements P, Q, R, S, have 6, 11, 15 and 17 electrons respectively, therefore
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A.
P will form an electrovalent bond with R
B.
Q will form a covalent bond with S
C.
R will form an electrovalent bond with S
D.
Q will form an electrovalent bond with S

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