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Question 1 Report
In which of these groups will all the substances be insoluble in water?
Question 3 Report
The high boiling point of hydrogen fluoride can be explained in terms of?
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Question 4 Report
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
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Question 5 Report
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
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Question 9 Report
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
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Question 10 Report
A device used in the laboratory for intermittent production of gases without heating is
Question 11 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 12 Report
What is the colour of phenolphthalein indicator in a basic medium?
Question 13 Report
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
Question 16 Report
Brownian motion explains
Question 17 Report
The most efficient absorber of ultraviolet radiation in the atmosphere is
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Question 18 Report
Chromatography is used to separate components of mixtures which differ in their rates of
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Question 19 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 20 Report
What is the maximum number of electrons that an f-orbital can accommodate?
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Question 21 Report
The type of reaction ethyne mainly undergoes is
Question 24 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 25 Report
A measure of the degree of disorderliness in a chemical system is known as the
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Question 26 Report
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
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Question 28 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 30 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 31 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 33 Report
The rate of a chemical reaction is NOT affected by one of these factors
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Question 34 Report
In which of the following equations can Le-chartelier’s principle be applied?
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Question 35 Report
Which of these arrangement of elements is in order of increasing ionization energy?
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Question 36 Report
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
Question 37 Report
Which of the following compounds is unsaturated?
Question 38 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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Question 39 Report
The molecular formula of ethylbutanoate is?
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