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Frage 2 Bericht
Detergents are better than soaps for washing in hard water because
Frage 3 Bericht
The high boiling point of hydrogen fluoride can be explained in terms of
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Frage 5 Bericht
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
Frage 6 Bericht
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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Frage 7 Bericht
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
Frage 8 Bericht
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
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Frage 9 Bericht
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
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Frage 10 Bericht
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
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Frage 11 Bericht
A measure of the degree of disorderliness in a chemical system is known as the
Frage 12 Bericht
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.
Frage 13 Bericht
Faraday s first law of electrolysis can be expressed mathematically as
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Frage 15 Bericht
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
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Frage 16 Bericht
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
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Frage 17 Bericht
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
Frage 19 Bericht
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
Frage 21 Bericht
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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Frage 22 Bericht
The Kinetic theory can NOT be used to explain
Frage 25 Bericht
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
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Frage 27 Bericht
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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Frage 28 Bericht
How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]
Frage 29 Bericht
The best way to distinguish between Na2CO3and NaHCO2 is by.
Frage 32 Bericht
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
Frage 33 Bericht
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
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Frage 35 Bericht
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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Frage 36 Bericht
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
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Frage 38 Bericht
Which compound will have the lowest boiling point?
Frage 39 Bericht
The molar mass of a compound X is 56. its empirical formula is CH2. X is
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