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Frage 2 Bericht
\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is
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Frage 3 Bericht
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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Frage 5 Bericht
In which of these groups will all the substances be insoluble in water?
Frage 6 Bericht
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because
Frage 9 Bericht
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
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Frage 14 Bericht
The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces
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Frage 15 Bericht
The rate of a chemical reaction is NOT affected by one of these factors
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Frage 16 Bericht
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
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Frage 17 Bericht
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
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Frage 18 Bericht
What is the colour of phenolphthalein indicator in a basic medium?
Frage 19 Bericht
The most efficient absorber of ultraviolet radiation in the atmosphere is
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Frage 20 Bericht
The molecular formula of ethylbutanoate is?
Frage 22 Bericht
Chromatography is used to separate components of mixtures which differ in their rates of
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Frage 23 Bericht
Brownian motion explains
Frage 24 Bericht
Which of the following compounds is unsaturated?
Frage 27 Bericht
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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Frage 28 Bericht
A measure of the degree of disorderliness in a chemical system is known as the
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Frage 29 Bericht
Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of
Frage 30 Bericht
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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Frage 31 Bericht
In which of the following equations can Le-chartelier’s principle be applied?
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Frage 32 Bericht
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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Frage 33 Bericht
A device used in the laboratory for intermittent production of gases without heating is
Frage 34 Bericht
When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as
Frage 35 Bericht
The high boiling point of hydrogen fluoride can be explained in terms of?
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Frage 36 Bericht
What is the maximum number of electrons that an f-orbital can accommodate?
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Frage 39 Bericht
The type of reaction ethyne mainly undergoes is
Frage 41 Bericht
Which of these arrangement of elements is in order of increasing ionization energy?
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Frage 42 Bericht
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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