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Pergunta 1 Relatório
Chromatography is used to separate components of mixtures which differ in their rates of
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Pergunta 2 Relatório
A solution is prepared by dissolving I .96g of H2SO4 in 250 cm3 of its solution. What is the concentration in moles per dm3?
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Pergunta 3 Relatório
In which of the following equations can Le-chartelier’s principle be applied?
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Pergunta 4 Relatório
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
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Pergunta 6 Relatório
In which of these groups will all the substances be insoluble in water?
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Pergunta 8 Relatório
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
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Pergunta 9 Relatório
The electrode potential in volts of 2H+(aq) / H2(q) system is
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Pergunta 10 Relatório
If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula
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Pergunta 12 Relatório
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
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Pergunta 13 Relatório
Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?
M(s)+2HC1(aq) → MCI2 (aq) + H2(g)
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Pergunta 14 Relatório
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
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Pergunta 15 Relatório
What is the maximum number of electrons that an f-orbital can accommodate?
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Pergunta 17 Relatório
The most efficient absorber of ultraviolet radiation in the atmosphere is
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Pergunta 19 Relatório
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
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Pergunta 21 Relatório
Which of these arrangement of elements is in order of increasing ionization energy?
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Pergunta 25 Relatório
A measure of the degree of disorderliness in a chemical system is known as the
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Pergunta 27 Relatório
Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?
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Pergunta 28 Relatório
What is the colour of phenolphthalein indicator in a basic medium?
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Pergunta 30 Relatório
A device used in the laboratory for intermittent production of gases without heating is
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Pergunta 31 Relatório
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
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Pergunta 34 Relatório
Which of the following is a component of the car exhaust?
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Pergunta 35 Relatório
The rate of a chemical reaction is NOT affected by one of these factors
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Pergunta 37 Relatório
The high boiling point of hydrogen fluoride can be explained in terms of?
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Pergunta 40 Relatório
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
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Pergunta 41 Relatório
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the
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Pergunta 42 Relatório
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
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