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.
A salt which loses mass when exposed to air is
hygroscopic
deliquescent
efflorescent
fluorescent
effervescent
Correct answer is C
No explanation has been provided for this answer.
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
CH2
CH3
C2H2
C2H4
C2H6
Correct answer is B
No explanation has been provided for this answer.
6.02 x 10 23
3.01 x 1022
6.02 x 1022
5. 08 x 1022
3.01 x 1022
Correct answer is C
27g Aluminium = \(6.02 \times 10^{23}\)
1g Al = \(\frac{6.02 \times 10^{23}}{27}\)
2.7g Al = \(\frac{6.02 \times 10^{23}}{27} \times 2.7\)
= \(6.02 \times 10^{22} Al \) atoms
Which of the following does not affect the rate of a chemical reaction?
Addition or presence of a catalyst
Size of the reacting particles
The enthalpy change for the reaction
Concentration of the reactants
Temperatureat which the reaction is carried out
Correct answer is C
No explanation has been provided for this answer.
Which of the following compound is aromatic?
Benzene
Cyclobutane
Cyclopentane
Hexane
Ethene
Correct answer is A
No explanation has been provided for this answer.