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Question 1 Report
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
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Question 2 Report
The molar mass of a compound X is 56. its empirical formula is CH2. X is
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Question 3 Report
The best way to distinguish between Na2CO3and NaHCO2 is by.
Question 4 Report
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
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Question 5 Report
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
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Question 7 Report
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?
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Question 8 Report
Detergents are better than soaps for washing in hard water because
Question 9 Report
if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?
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Question 11 Report
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
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Question 12 Report
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
Question 14 Report
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
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Question 16 Report
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
Question 17 Report
A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.
What is the 42. relative molecular mass of X.
Question 18 Report
Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction
Question 19 Report
Which compound will have the lowest boiling point?
Question 24 Report
Faraday s first law of electrolysis can be expressed mathematically as
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Question 26 Report
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
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Question 29 Report
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
Question 30 Report
The high boiling point of hydrogen fluoride can be explained in terms of
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Question 31 Report
The Kinetic theory can NOT be used to explain
Question 32 Report
How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]
Question 33 Report
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
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Question 34 Report
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
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Question 36 Report
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
Question 38 Report
A measure of the degree of disorderliness in a chemical system is known as the
Question 40 Report
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
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Question 41 Report
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
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