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Chemistry WAEC / WASSCE 2009 Stoichiometry, Mole Concept & Volumetric Analysis
An important medical use of nuclear radiations is
A
activation analysis
B
carbon dating
C
radiotherapy
D
tissue regeneration
medium Difficulty
Chemistry WAEC / WASSCE 2009 Atomic Structure, Orbitals & Nuclear Chemistry
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
A
atomic number 17
B
atomic number 18
C
mass number 35
D
mass number 52
medium Difficulty
Chemistry WAEC / WASSCE 2009 Periodic Table & Periodicity
Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]
A
2He
B
10Ne
C
18Ar
D
36Kr
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry, Mole Concept & Volumetric Analysis
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
A
ammonia
B
carbon(IV)oxide
C
hydrogen chloride
D
sulphur (IV) oxide
E
sulphur (VI) oxide
medium Difficulty
Chemistry NECO SSCE 2009 Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following equations is NOT balanced?
A
CH4(g) + 202(9) → CO2(g) + 2H2O(g)
B
CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)
C
2KCIO3(s) → 2KCI(s)+ 3O2(g)
D
NaH(s) + H2O(1) → NaOH(aq) +H2(g)
E
Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
medium Difficulty
Chemistry NECO SSCE 2009 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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 Stoichiometry, Mole Concept & Volumetric Analysis
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 & Volumetric Analysis
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 Oxidation, Reduction & Redox Reactions
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 Kinetic Theory of Matter & Gas Laws
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 Organic Chemistry I: Hydrocarbons & Crude Oil
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 Periodic Table & Periodicity
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 & Volumetric Analysis
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 Organic Chemistry II: Functional Groups, Polymers & Biomolecules
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 Stoichiometry, Mole Concept & Volumetric Analysis
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
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