In an electrochemical cell, polarization is caused by
Răspuns
(B)
Hydrogen
2
The condition required for corrosion to take place is the presence of
Răspuns
(B)
Water and Oxygen
3
The enzyme used in the hydrolysis of starch to dextrin and maltose is
Răspuns
(C)
Amylase
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
Răspuns
(A)
Concentrated tetraoxosulphate (VI) acid
5
The monomer of nylon is
Răspuns
(B)
Hexanedioic acid
6
The principle of column chromatography is based on th ability of the constituents to
Răspuns
(D)
Move at different speeds in the column
7
Ammonium chloride can be separated from its mixture with common salt by
Răspuns
(D)
Sublimation
8
The ability of carbon to form long chains is referred to as
Răspuns
(D)
Catenation
9
The industrial preparation of hydrogen gas from water gas is referred to as
Răspuns
(A)
Bosch 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
Răspuns
(D)
6.9
11
The colour of litmus in an alkaline medium is
Răspuns
(D)
Blue
12
The compounds CH3CH2CHO and CH3COCH3 can be distinguished from each other using
Răspuns
(C)
Tollen's reagent
13
Which of the following statements is true about 2-methylpropane and butane
Răspuns
(B)
They are members of same homologous series
14
The process that requires the use of hardwater in its operation is
Răspuns
(B)
Bottling
15
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na=23, O=16, H=1]
Răspuns
(C)
0.50 moldm-3
16
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Răspuns
(B)
Cobalt-60
17
The compound produced when sodium peroxide is heated with excess sodium is
Răspuns
(B)
Na2O
18
The pollutant that contributes to the depletion of the ozone layer is
Răspuns
(A)
CFCs
19
Which of the following properties is not peculiar to matter?
Răspuns
(B)
Random motion of particles increases from gas to solid
20
Cast iron is used in making
Răspuns
(D)
Stoves and cookers
21
Which of the following compounds is used as a gaseous fuel?
Răspuns
(C)
CH3 -CH2 -CH2 -CH3
22
The products formed when primary Alkanols are oxidized using acidified potassium tetraoxomanganate (VII) are what?
Răspuns
(A)
CH3CH2CHO and H2O
23
Alkanols have the general molecular formula
Răspuns
(D)
CnH2n+1OH
24
Which of the following is not an alkali?
Răspuns
(D)
Al(OH)3
25
Which of the following statements is correct about the periodic table?
Răspuns
(D)
The valence electrons of the elements increase progressively across the period
26
The metal whose ore can be concentrated by passing it through a magnetic separator is
Răspuns
(B)
Sn
27
An example of an acidic oxide is
Răspuns
(C)
SO2
28
What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?
Răspuns
(A)
2.0cm 3
29
Diamond cannot be used
Răspuns
(A)
In making bicycle chains
30
Ethanol is soluble in water due to the presence of a
Răspuns
(B)
Hydroxyl group
31
The number of electronic shells contained in an atom with electron configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^6\)4S\(^2\) is
Răspuns
(C)
4
32
The drying agent suitable for drying ammonia is
Răspuns
(B)
Calcium Oxide
33
The arrangement of particles in crystal lattices can be studied using
Răspuns
(A)
X-rays
34
In the extraction of iron, the waste gas from the furnace is a mixture of
Răspuns
(C)
N2 , CO and CO2
35
In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is
Răspuns
(D)
Purple
36
An example of a solid emulsion is
Răspuns
(A)
Butter
37
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
Răspuns
(B)
15
38
Calculate the volume in cm3 of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
Răspuns
(A)
0.056dm3
39
The gas that is used for the treatment of cancer is
Răspuns
(B)
Radon
40
A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as
