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 is a example of a chemical change?
Dissoultion of salt in water
Rusting of iron
Melting of ice
Separating a mixture by distillation
Correct answer is B
No explanation has been provided for this answer.
Chromatography is used to separate components of mixtures which differ in their rates of?
diffusion
migration
reaction
sedimentaion
Correct answer is B
No explanation has been provided for this answer.
Which of the following reagents will confirm the presence of unsaturation in a compound?
Fehling's solution
Bromine water
Tollen's reagent
Benedict's solution
Correct answer is B
No explanation has been provided for this answer.
One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?
an alkane
an alkene
an alkyne
aromatic (C = 12, H = 1)
Correct answer is B
No explanation has been provided for this answer.
The general formula of alkanoates is?
RCHO
R2CO
RCOOH
RCOOR
Correct answer is D
Otherwise known as ESTERS, they are easily gotten from a reaction between the CARBOXYLIC acids and ALCOHOLS
RCOOH + R'OH yields a combination of an ester(RCOOR') and water.