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 boiling point of pentane is higher than that of propane because?
carbon-carbon single bonds are stronger than carbon-hydrogen bonds.
Pentane has more covalent bonds to break
Pentane does not burn easily as propane
The intermolecular forces in pentane are stronger than those of propane
Correct answer is B
The boiling points of alkanes increase with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases.
A factor that is considered most important when siting a chemical industry is?
nearness to other industrial establishments
nearness to raw materials
favourable climate conditions
availability of storage facilities
Correct answer is B
No explanation has been provided for this answer.
Which of the following pairs of elements has the greatest difference in electronegativity?
Na and F
Na and CI
Na and Br
Na and I
Correct answer is A
- sodium has an electro negativity of 0.93
- Hence; sodium and flourine have the highest difference.
| Fluorine | 4.0 |
| Chlorine | 3.0 |
| Bromine | 2.8 |
| Iodine | 2.5 |
A balanced chemical equation is based on the law of?
Periodicity
Constant composition
Multiple proportion
Conservation of mass
Correct answer is D
The law of conservation of mass is important because it allows us to predict the amount of product formed in a chemical reaction, as well as the amount of consumed reactant.
The oxidation state of chlorine in NaClO\(_3\) is?
+1
+3
+5
+6
Correct answer is C
The oxidation number of chlorine in NaClO3 is +5.