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Frage 2 Bericht
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
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Frage 3 Bericht
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
Frage 6 Bericht
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
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Frage 7 Bericht
Detergents are better than soaps for washing in hard water because
Frage 8 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 9 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 10 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 11 Bericht
A measure of the degree of disorderliness in a chemical system is known as the
Frage 12 Bericht
How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]
Frage 15 Bericht
Which compound will have the lowest boiling point?
Frage 16 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 17 Bericht
The high boiling point of hydrogen fluoride can be explained in terms of
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Frage 19 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 21 Bericht
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
Frage 22 Bericht
Faraday s first law of electrolysis can be expressed mathematically as
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Frage 24 Bericht
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
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Frage 25 Bericht
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
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Frage 26 Bericht
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
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Frage 28 Bericht
The best way to distinguish between Na2CO3and NaHCO2 is by.
Frage 29 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 30 Bericht
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
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Frage 33 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 36 Bericht
The Kinetic theory can NOT be used to explain
Frage 37 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 38 Bericht
The molar mass of a compound X is 56. its empirical formula is CH2. X is
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Frage 40 Bericht
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
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Frage 41 Bericht
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
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