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Vraag 4 Verslag
When air is passed through alkaline pyrogallol and then lime water, the gases left are
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Vraag 5 Verslag
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
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Vraag 7 Verslag
Which of the following salt solutions will have a pH greater than 7?
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Vraag 9 Verslag
The scientist who discovered the zig-zag movement of gas molecules is
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Vraag 11 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 12 Verslag
The relationship between equilibrium constant and free energy change is represented as
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Vraag 13 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 15 Verslag
Brain tumors can be located by using an isotope of
Vraag 17 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 19 Verslag
Which of the following compounds will undergo thermal dissociation?
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Vraag 21 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 22 Verslag
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
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Vraag 24 Verslag
The process involved in the decomposition of sugar by an enzyme is called
Vraag 25 Verslag
Which of the following statements is NOT correct of group VII elements? They
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Vraag 26 Verslag
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
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Vraag 27 Verslag
Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group
Vraag 28 Verslag
C\(_6\)H\(_{12}\)O\(_6\)
What is the molar mass of the compound above?
[ H=1, C=12, O=16 }
Vraag 29 Verslag
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
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Vraag 30 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 32 Verslag
The rate of a reaction usually increases with increase in the concentration of reactants because the
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Vraag 34 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 35 Verslag
Sulphur has an oxidation number of +4 in
Vraag 36 Verslag
The reaction of an alkanol with alkanioc acid is known as
Vraag 39 Verslag
Which of the following gases is absorbed from the air dun photosynthesis?
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Vraag 43 Verslag
During the extraction of iron in the blast furnance, slag is produced using
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Vraag 44 Verslag
The green house effect is a climatic condition associated with the presence of excess
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Vraag 45 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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