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