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Vraag 3 Verslag
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]
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Vraag 4 Verslag
Which of the following statements is NOT correct of group VII elements? They
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Vraag 5 Verslag
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
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Vraag 7 Verslag
Sulphur has an oxidation number of +4 in
Vraag 8 Verslag
In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are
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Vraag 9 Verslag
During the extraction of iron in the blast furnance, slag is produced using
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Vraag 11 Verslag
Brain tumors can be located by using an isotope of
Vraag 14 Verslag
The green house effect is a climatic condition associated with the presence of excess
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Vraag 15 Verslag
The rate of a reaction usually increases with increase in the concentration of reactants because the
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Vraag 16 Verslag
The relationship between equilibrium constant and free energy change is represented as
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Vraag 17 Verslag
Which of the following compounds will undergo thermal dissociation?
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Vraag 18 Verslag
What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g)
[CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]
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Vraag 19 Verslag
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
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Vraag 20 Verslag
C\(_6\)H\(_{12}\)O\(_6\)
What is the molar mass of the compound above?
[ H=1, C=12, O=16 }
Vraag 23 Verslag
What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]
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Vraag 24 Verslag
If the volume of a gas at 35°C is 60cm3, what would be its volume in cm3 at 273k?
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Vraag 27 Verslag
Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group
Vraag 29 Verslag
\( ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy \)
The equation above represent a/an
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Vraag 30 Verslag
The reaction of an alkanol with alkanioc acid is known as
Vraag 32 Verslag
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
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Vraag 35 Verslag
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
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Vraag 36 Verslag
When air is passed through alkaline pyrogallol and then lime water, the gases left are
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Vraag 37 Verslag
The scientist who discovered the zig-zag movement of gas molecules is
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Vraag 39 Verslag
Which of the following salt solutions will have a pH greater than 7?
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Vraag 41 Verslag
The process involved in the decomposition of sugar by an enzyme is called
Vraag 44 Verslag
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
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Vraag 47 Verslag
Which of the following gases is absorbed from the air dun photosynthesis?
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