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Chemistry NECO SSCE 2001 Matter & Separation Techniques
The Kinetic theory can NOT be used to explain
A
allotropy.
B
Brownian movement.
C
diffusion.
D
Tyndal effect.
E
vaporization.
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
The best way to distinguish between Na2CO3and NaHCO2 is by.
A
adding an acid.
B
adding an alkali.
C
dissolving in water.
D
exposing to air.
E
heating.
medium Difficulty
Chemistry NECO SSCE 2001 Acids, Bases, and Salts
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?
A
I and II
B
I and III
C
I and IV
D
II and III
E
II and IV
medium Difficulty
Chemistry NECO SSCE 2001 Electrochemistry and Redox
Faraday s first law of electrolysis can be expressed mathematically as
A
m=I/it
B
mαit
C
Q=it
D
QαI/it
E
Qαit
medium Difficulty
Chemistry NECO SSCE 2001 Stoichiometry & Mole Concept
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.
A
5
B
12
C
18
D
45
E
50
medium Difficulty
Chemistry NECO SSCE 2001 Acids, Bases, and Salts
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
A
conversion.
B
elimination.
C
oxidation.
D
reduction.
E
substitution.
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
A
NaCl(s) is non-ionic but NaCl(aq) is ion
B
NaCl(aq) contains mobile electrons, where absent in NaCl(s).
C
NaCl(aq) contains mobile ions which Nacl,) does not contain.
D
NaCl(s) ionizes partiality while NaCl(aq) iodizes completely.
E
NaCl(s) decomposes when heated but NCl(aq) is stable to heat. –
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
A
Ba(NO3)2(aq) then HNO3(aq).
B
HCl(aq) then Ba(NO3)2(aq).
C
HCl(aq) then Ag3(aq).
D
HNO3(aq) then fresh FeSO4(aq).
E
HNO3(aq) then AgNO3(aq).
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
A
boiling off the ethanoic
B
filtration
C
fractional crystallisation
D
fractional distillation
E
isomerisation
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
Which method is NOT used to determine rate of a reaction?
A
change in amount of precipitate formed
B
change in equilibrium constant
C
change in intensity of colour
D
change in pH values.
E
change in total gas pressure
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
Detergents are better than soaps for washing in hard water because
A
hard water contains insoluble calcium salts.
B
they contain bleaching powder.
C
they contain palmitic acid.
D
they do not form insoluble calcium and magnesium salts.
E
they are organic compounds.
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
Fructose and glucose are
A
allotropes of each other.
B
both disaccharides
C
dimere of each other.
D
isomers of each other
E
isotopes of each other
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
A measure of the degree of disorderliness in a chemical system is known as the
A
activation energy
B
enthalpy
C
entropy
D
equilibrium
E
free energy.
medium Difficulty
Chemistry NECO SSCE 2001 Acids, Bases, and Salts
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.?
A
164 cm3
B
168 cm3
C
179.1.cm3
D
201.5cm3
E
546 cm3
medium Difficulty
Chemistry NECO SSCE 2001 Matter & Separation Techniques
Which compound is a component of baking powder?
A
Na2CO3
B
Na2SO4
C
KH2CO3
D
NaHCO3
E
NaHSO4
medium Difficulty
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