A noble gas with high fog-penetrating power used in aerodrome beacons is
12
Permanent hardness of water can be removed by
13
Substances used as drying agents are usually
14
Calculate the solubility (mol dm−3) of 40 g of CuSO4 dissolved in 100 g of water at 120 °C. [Cu = 64, S = 32, O = 16]
15
Coffee stains can best be removed by
16
Carbon (II) oxide is considered dangerous if inhaled mainly because itcan cause injury to the nervous system
17
The acid that is used to remove rust is
18
Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH
19
The colour of methyl orange in alkaline medium is
20
Which of the following salts is slightly soluble in water?
21
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq) In the above reaction, the reducing agent is
22
The IUPAC nomenclature of the compound LiAlH4 is
23
Iron can be protected from corrosion by coating the surface with
24
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol-1]
25
In which of the following is the entropy change positive?
26
If a reaction is exothermic and there is a great disorder, it means that
27
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
28
The graph above demonstrate the effect of
29
2H2(g) + O2(g) ⇋ 2H2O(g) ΔH = - ve. What happens to the equilibrium constant of the reaction above if the temperature is increased?
30
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of
31
In the diagram above, the gas produced is
32
Which of the following is used in rocket fuels?
33
34
A constituent common to bronze and solder is
35
When iron is exposed to moist air, it gradually rusts. This is due to the formation of
36
A compound gives an orangered colour to non-luminous flame. This compound is likely to contain
37
Stainless steel is used for making
38
The residual solids from the fractional distillation of petroleum are used as
39
The IUPAC nomenclature of the compound above is
40
Which of the following is used as fuel in miners' lamp?
41
Which of the following organic compounds is very soluble in water?
42
Benzene reacts with hydrogen in the presence of nickel catalyst at 180⁰C to give
43
Which of the following is used to hasten the ripening of fruit?
44
The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and
45
The correct order of increasing boiling points of the following compounds C3H7OH, C7H16 and C4H10 is
46
One of the major uses of alkane is
47
The haloalkanes used in drycleaning industries are
48
Two hydrocarbons X and Y were treated with bromine water. X decolorized the solution and Y did not not. Which class of compound does Y belong?
