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.
In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?
One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water
One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water
One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water
Correct answer is E
The oxidation of hydrogen by oxygen gives water and a certain amount of heat of formation.
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
1s2 2s22p6 3s2
1s2 2s22p6 3s2 3p1s2 2s22p6 3s1
1s2 2s22p6 3s1
1s2 2s22p6 3s°
1s2 2s22p6 4s1
Correct answer is C
No explanation has been provided for this answer.
A polymerization reaction is one in which?
small molecules form giant molecules
atoms form molecules
giant molecules form small molecules
molecules form volatile compounds
a molecule rearranges itself
Correct answer is A
No explanation has been provided for this answer.
Allotropes are elements having?
different physical but the same chemical properties
different chemical but the same physical properties
the same chemical and physical properties
different atomic structure
the same position in the periodic table
Correct answer is A
Allotropes: These are the different forms of elements having different physical properties but the same chemical properties.
For example, the allotropes of carbon. Crystalline form: Diamond, Graphite and Fullerene
Which of the following can have an isomer?
C2H4
C4H10
C3H8
C2H6
C6H6
Correct answer is B
Butane is an alkane with four carbon atoms so molecular formula is C4H10. It has two isomers; n-butane and isobutane.