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Chemistry NECO SSCE 2009 Matter & Separation Techniques
The process involved in the decomposition of sugar by an enzyme is called
A
dehydration
B
esterification
C
fermentation
D
polymerization
E
saponification
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
Which of the following non-metals reacts most readily with metals?
A
Carbon
B
Chlorine
C
Nitrogen
D
Phosphorus
E
Sulphur
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]
A
CH
B
CH3
C
CH4
D
C2H2
E
C2H6
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
A
HOCH2 – CH2OH
B
H2C –C =C– CH3
C
H3C – HC = CH2
D
H2C = CH2
E
H3C – C =CH
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
The scientist who discovered the zig-zag movement of gas molecules is
A
Brownian
B
Dalton
C
Gay Lussac
D
Graham
E
Newton
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
Which of the following is NOT a fraction of petroleum?
A
Bitumen
B
Coal
C
Diesel
D
Kerosene
E
Petrol
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
Which of the following statements is NOT correct of group VII elements? They
A
are diatomic
B
are good oxidizing agents
C
are highly electronegative
D
have high electron affinity
E
have relatively low ionization potentials
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry & Mole Concept
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
A
CH2
B
CH3
C
C2H2
D
C2H4
E
C2H6
medium Difficulty
Chemistry NECO SSCE 2009 Acids, Bases, and Salts
The reaction of an alkanol with alkanioc acid is known as
A
dehydration
B
esterification
C
halogenation
D
hydrogenation
E
saponification
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
The rate of a reaction usually increases with increase in the concentration of reactants because the
A
distance between particles of the reactants increases
B
frequency of collision of particles is lower
C
particles of the reactants gain energy and move faster
D
reactants from a complex which decomposes rapidly
E
reactants occupy a higher energy level
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
Which of the following compounds will undergo thermal dissociation?
A
AgCl
B
CaCO3
C
K2S04
D
NaOH
E
NH4CI
medium Difficulty
Chemistry NECO SSCE 2009 Acids, Bases, and Salts
Which of the following gases will bleach moist litmus paper?
A
Cl2
B
CO2
C
HCl
D
N2O
E
SO3
medium Difficulty
Chemistry NECO SSCE 2009 Atomic Structure and Periodic Table
What kind of bond exist between carbon and oxygen in C03 2-?
A
Co- ordinate Covalent
B
covalent
C
Electrovalent
D
Metallic
E
Van der Waal forces
medium Difficulty
Chemistry NECO SSCE 2009 Atomic Structure and Periodic Table
Which of these compounds has the greatest ionic character?
A
AlF3
B
BF2
C
CF4
D
CsF
E
NaF
medium Difficulty
Chemistry NECO SSCE 2009 Matter & Separation Techniques
\( ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy \) The equation above represent a/an
A
alpha particle emission
B
endothermic reaction
C
nuclear fission
D
nuclear fusion
E
thermal dissociation
medium Difficulty
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