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