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.
The main impurity in iron ore during the extraction of iron is
Silicon (IV) oxide
Carbon (IV) oxide
Calcium trioxosilicate
Sulphur (II) oxide
Correct answer is A
No explanation has been provided for this answer.
The general formula for the alkanals is
ROH
R2CO
RCOOR1
RCHO
Correct answer is D
No explanation has been provided for this answer.
breaking down of carbohydrate to glucose
conversion of sugar to alcohol in the presence of yeast
breaking down of sugar to carbohydrate
conversion of alcohol to sugar in the presence of yeast
Correct answer is B
No explanation has been provided for this answer.
NH3(g) + HCl(g) → NH4Cl(s)
The entropy change in the system above is
negative
indeterminate
positive
zero
Correct answer is A
The entropy change for the transition from gas to solid is negative because solids have lower entropy compared to gases, gas particles are more disordered and have a higher rate of motion compared to solids that have closely packed particles
In which of the following reactions has the oxidation number of nitrogen increased?
2NO(g) + Br2(l) → 2NOBr(l)
2NO(g) + O2(g) → 2NO2(g)
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
2NO(g) + Cl2(g) → 2NOCl(l)
Correct answer is B
No explanation has been provided for this answer.