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