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Chemistry
WAEC / WASSCE 1988
Stoichiometry & Mole Concept
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
A
CH2
B
CH3
C
C2H2
D
C2H4
E
C2H6
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 1988
Stoichiometry & Mole Concept
Which of the following types of hybridization gives rise to tetrahedral molecules?
A
sp
B
sp2
C
sp3
D
sp3d
E
sp3d2
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Stoichiometry & Mole Concept
Solution
An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
A
law of multiple proportions
B
law of chemical proportions
C
law of simple proportions
D
law of conservation of mass
E
law of definite proportions
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Stoichiometry & Mole Concept
Solution
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
A
disintegration
B
polymerization
C
cracking
D
degradation
E
distillation
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Stoichiometry & Mole Concept
Solution
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
A
in the beaker
B
in the conical flask
C
in a burette
D
in the standard flask
E
in the measuring cylinder
medium Difficulty
Study Explanation