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Question 1 Report
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
Question 2 Report
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
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Question 4 Report
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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Question 7 Report
The molecular formula of ethylbutanoate is?
Question 9 Report
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
Question 10 Report
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?
Question 11 Report
In which of these groups will all the substances be insoluble in water?
Question 12 Report
Brownian motion explains
Question 14 Report
The most efficient absorber of ultraviolet radiation in the atmosphere is
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Question 15 Report
Which of the following compounds is unsaturated?
Question 16 Report
The high boiling point of hydrogen fluoride can be explained in terms of?
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Question 17 Report
The type of reaction ethyne mainly undergoes is
Question 18 Report
The rate of a chemical reaction is NOT affected by one of these factors
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Question 20 Report
Which of these arrangement of elements is in order of increasing ionization energy?
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Question 21 Report
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
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Question 22 Report
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
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Question 23 Report
What is the maximum number of electrons that an f-orbital can accommodate?
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Question 26 Report
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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Question 30 Report
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
Question 31 Report
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
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Question 33 Report
A device used in the laboratory for intermittent production of gases without heating is
Question 34 Report
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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Question 35 Report
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
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Question 36 Report
In which of the following equations can Le-chartelier’s principle be applied?
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Question 37 Report
A measure of the degree of disorderliness in a chemical system is known as the
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Question 40 Report
Chromatography is used to separate components of mixtures which differ in their rates of
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Question 41 Report
What is the colour of phenolphthalein indicator in a basic medium?
Question 42 Report
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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