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