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 which of the following changes is ∆S negative ?
H2O(l) → H2O(s)
C(s) + 1/2O2,/sub>(g) → CO(g)
PCI5(g) → PCl3(g) + Cl2(g)
NaCl(s) + aq →Na+ (aq) + Cl- (aq)
NH3(g) + HCl(g)
Correct answer is A
No explanation has been provided for this answer.
an acidic oxide
a basic oxide
an amphoteric oxide
a neutra oxide
a mixed oxide
Correct answer is A
No explanation has been provided for this answer.
What does X atand for in the following expression? X = Log(10)(H+)
Enthalpy change (∆H)
Equilibrium constant (K)
Solubility product
Degree of acidity (pH)
lonic product of water
Correct answer is D
No explanation has been provided for this answer.
Carbon is often deposited in the exhaust-pipe of cars because of the?
presence of carbon in petrol
presence of carbon in petrol
incomplete combustion of petrol
presence of additives in petrol
contamination of petrol with diesel
Correct answer is C
The incomplete combustion process that occurs in an engine; result to the emission of carbon monoxide (CO) as a waste product from the exhaust system of vehicles.
Environmental carbon monoxide is produced by incomplete combustion process from any carbon containing fuel.
Which of the following pairs illustrates isotopy?
But-l-ene and but -2-ene
Ortho-hydrogen and parahydrogen
Oxygen and ozone
Hydrogen and deuterium
Alpha-particle and beta-particle
Correct answer is D
No explanation has been provided for this answer.