## Chemistry (2016) Study Mode

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1.
In an electrochemical cell, polarization is caused by
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A.
Oxygen
B.
Hydrogen
C.
Tetraoxosulphate(IV) acid
D.
Chlorine

2.
The condition required for corrosion to take place is the presence of
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A.
Oxygen and Carbon (IV) oxide
B.
Water and Oxygen
C.
Water and Carbon (IV) oxide and Oxygen
D.
Water and Carbon (IV) oxide

3.
The enzyme used in the hydrolysis of starch to dextrin and maltose is
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A.
Zymase
B.
Sucrase
C.
Amylase
D.
Lactase

4.
In the laboratory preparation of chlorine from concentrated hydrochloric acid in the presence of potassuim tetraoxomanganate(VII) the produced is dried by passing it through
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A.
Concentrated tetraoxosulphate (VI) acid
B.
Anhydrous calcium chloride
C.
Calcium oxide
D.
Sodium hydroxide

5.
The monomer of nylon is
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A.
Hydroxybenzene
B.
Hexanedioic acid
C.
Benzene -1,-4-dicarboxylic acid
D.
Ethane-1,2-diol

6.
The principle of column chromatography is based on th ability of the constituents to
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A.
React with the solvent in the column
B.
React with each other in the solvent in the column
C.
Dissolve in each other in the column
D.
Move at different speeds in the column

7.
Ammonium chloride can be separated from its mixture with common salt by
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A.
Distillation
B.
Evaporation
C.
Decantation
D.
Sublimation

8.
The ability of carbon to form long chains is referred to as
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A.
Alkylation
B.
Acylation
C.
Carbonation
D.
Catenation

9.
The industrial preparation of hydrogen gas from water gas is referred to as
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A.
Bosch process
B.
Contact process
C.
Haber process
D.
Bayer Process

10.
The relative atomic mass of a naturally occurring lithium consisting of 90%$$\frac{7}{3}$$Li and 10%$$\frac{6}{3}$$Li is
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A.
6.2
B.
6.8
C.
7.1
D.
6.9
Explanation. Give a better Explanation
($$\frac{90}{100}$$ x 7) + ($$\frac{10}{100}$$ x 6)

= 6.3 + 0.6 = 6.9

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