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1
Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
2
How many atoms are present in 6.0 g of magnesium? [Mg = 24, NA = 6.02 × 1023 mol−1]
3
50 cm³ of gas was collected over water at 10°C and 765 mmHg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10°C is 5 mmHg.
4
An increase in the pressure exerted on gas at a constant temperature results in
5
In the reaction 2H2(g) + O2(g) → 2H2O(g), what volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube?
6
Which of the following are evidences for the particulate nature of matter?
I. Evaporation
II. Sublimation
III. Diffusion
IV. Brownian motion
7
If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?
8
A hydrogen atom which has lost an electron contains
9
The electronic configuration of Mg2+ is
11
Which of the following is used to study the arrangement of particles in crystal lattices?
12
Which of the following shows that air is a mixture?
I. It has varied composition from place to place. II. Its constituents can be separated by physical means. III. It contains unreactive noble gases.
13
The chemicals used to soften hard water involve the addition of
14
Chlorination of water for town supply is carried out to
15
The solubilities of different solutes in a given solvent can be compared by
16
Potassium trioxochlorate(V) (KClO3) has a solubility of 1.5 mol dm−3 at 45°C. On cooling this solution to 20°C, the solubility becomes 0.5 mol dm−3. What mass of KClO3 crystallized out from 1 dm³ of solution? [K = 39, Cl = 35.5, O = 16]
17
Which of the following pollutants is associated with brain damage?
18
Which of the following will produce a solution with pH less than 7 at equivalence point?
19
The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its
20
During a titration experiment, 0.05 moles of carbon(IV) oxide is liberated. What is the volume of gas liberated at s.t.p.?
21
A major factor considered in selecting a suitable method for preparing a simple salt is its
22
The oxidation number of boron in NaBH4 is
23
2Na2O2(s) + 2H2O2(I) → 4NaOH(s) + O2(s). Which substance is oxidized?
24
What number of moles of Cu2+ will be deposited by 360 coulombs of electricity? [F = 96500 C mol−1]
25
A metal M displaces zinc from ZnCl, solution. This shows that
26
CO(g) + H2O(g) → CO2(g) + H2(g). Calculate the standard heat change if the standard enthalpies of formation of CO2g, H2O(g) and CO(g) in KJ mol-1 are −394, −242 and −110 kJ mol−1 respectively.
27
An increase in entropy can best be illustrated by
28
The highest rate of production of carbon(IV) oxide can be achieved using
29
2HCl(aq) + CaCO3(s) → CaCl2(s) + CO2(g) + H2O(l). From the curves L, M, N, P, which represents the production of CO2 gas as dilute HCl is added?
30
2CO(g) + O2(g) ⇌ 2CO2(g). High pressure will favour the forward reaction because the process
31
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be
32
Which gas has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
33
Commercial bleaching can be carried out using
34
Mineral acids are usually added to commercial hydrogen peroxide to
35
Which compound will give a brick‑red colour in a non‑luminous Bunsen flame?
36
The purest form of iron which contains only about 0.1% carbon is
37
A characteristic shared by zinc and other transition elements is the ability to
38
Which of the following metals is the least reactive?
39
Geometric isomerism can exist in
40
Alkanals can be distinguished from alkanones by reaction with
42
Carbohydrates have the general formula Cx(H2O)y. In which of the following pairs is x not equal to y?
43
A compound contains 40.0% C, 6.7% H and 53.3% O. If the molecular mass is 180, its molecular formula is [C = 12, H = 1, O = 16]
44
The alkyne that will give a white precipitate with silver trioxonitrate(V) is
45
The saponification of an alkanoate to produce soap and alkanol involves
46
2‑methylpropan‑2‑ol is an example of a
47
The final oxidation product of alkanol, alkanal and alkanoes is
48
Ethanol reacts with concentrated tetraoxosulphate(VI) acid at a temperature above 170°C to form
49
An example of an oxidation–reduction enzyme is
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