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.
Which of the following gasses is highly soluble in water at room temperature
ammonia
carbon (IV) oxide
chlorine
nitrogen
Correct answer is A
No explanation has been provided for this answer.
The formation of ethene from dehydration of ethanol can be described as-------
an addition reaction
an elimination reaction
an oxidation reaction
a substitution reaction
Correct answer is B
No explanation has been provided for this answer.
NaCl and KNO\(_{3}\)
KCL and NaNO\(_{3}\)
K\(_{2}\)SO\(_{4}\) and BaCl\(_{2}\)
NH\(_{4}\)NO\(_{3}\) and CO\(_{3}\)
Correct answer is C
when potassium sulfate is mixed with barium chloride a white precipitate of barium sulfate will be form. barium sulfate is slightly soluble in water, so it will precipitate out as a solid
BaCl2 + K2SO4 → BaSO4 + 2KCl
note; all substances are aqueous except BaSO4 which is solid
The alkanol represented by the structure above is
primary and dihydric
secondary and monohydric
tertiary and dihydric
secondary and dihydric
Correct answer is A
It is primary alcohol because it has only one alkyl group and dihydric because it has two hydroxyl groups
If humid air is polluted by chlorine discharged, the air can be restored by sprinkling
solid MnO\(_{2}\)
acidified KMnO\(_{4}\)
acidified FeSO\(_{4}\)
saturated NaCl(aq)
Correct answer is B
Chlorine is a toxic gas and when it pollutes the air, it can be neutralized by using acidified KMnO4. The reaction between chlorine and acidified KMnO4 results in the formation of chloride ions, manganese(II) ions, and water, which are harmless. This is why acidified KMnO4 is used to restore air polluted by chlorine discharge.