Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
the initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant
the occur when large pieces of marble are used and is due to a small surface area of reactant
the initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant
the initial slope of the curve is steepest and this occur when large surface area of reactant
the initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant
Correct answer is C
No explanation has been provided for this answer.
A
B
C
D
E
Correct answer is D
The boiling points of each of the compounds:
Pentane - 36.1°C ; 2- methylbutane - 27.8°C ; dimethylpropane - 10°C.
Therefore, the order of boiling point in ascending order is Dimethylpropane < 2-methylbutane < pentane.
Which of the following compounds will take up the molecules of bromine?
l
ll
lll
l and ll
l and lll
Correct answer is B
No explanation has been provided for this answer.
The IUPAC name for the compound is
2,3-dimethylpent-2,3-ene
2, 3- dimethylpent-2-ene
3, 4-dimethylpent-3-ene
3,4-dimethylpentene
3,4-dimethlhept-2-ene
Correct answer is B
The IUPAC name of the given compound(carefully examined) is 2,3 - dimethyl pent - 2 - ene.
pure nitrogen
a mixture of nitrogen and oxygen
a mixture of nitrogen and carbondioxide
a mixture of oxygen and inert gases
a mixture of nitrogen and inert gases
Correct answer is E
Alkaline solutions of pyrogallol absorb oxygen efficiently and are used in determining the oxygen content of gas mixtures.
calcium chloride absorbs sufficient moisture/water from the air.
So,Nitrogen and Inert gases will be left