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.
direct combination is involved and the reaction is endothermic
a solid is formed and heat is evolved
activation energy is high and a catalyst is required
the reaction is endothermic and occurs at high temperature
Correct answer is B
No explanation has been provided for this answer.
What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1
lonization energy
Electron affinity
Dissociation energy
Heat of atomization
Correct answer is B
No explanation has been provided for this answer.
It can be concluded that gastric juice
contains enzymes
is acidic
is a mixture
has pH value of 7
Correct answer is B
No explanation has been provided for this answer.
NH3
SO2
HCI
CO2
Correct answer is D
No explanation has been provided for this answer.
In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?
CaO + 2HNO3 → Ca(NO3) 2 + H 2O
Cu + 4HNO3 → Cu(NO 3)2 + 2H2O + 2NO2
S + 6HNO3 → H2SO 4 + 6NO2 + 2H2O
P + 5HNO3 → H 3PO 4 + 5NO2 + H2O
Correct answer is A
No explanation has been provided for this answer.