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.
What volume of oxygen will remain after reacting 8cm3 of hydrogen gas with 20cm3 of oxygen gas
10cm3
12cm3
14cm3
16cm3
Correct answer is D
No explanation has been provided for this answer.
Suitable reagents for the laboratory preparation of nitrogen are
sodium dioxonitrate(III) and ammonium chloride
sodium trioxonitrate(V) and ammonium chloride
sodium chloride and ammonium trioxonitrate(V)
sodium chloride and ammonium di-ozonitrate(III)
Correct answer is A
No explanation has been provided for this answer.
Extractive distillation
Filtration followed by distillation
Neutralization with sodium hydroxide followed by distillation
Neutralization with sodium hydroxide followed by filtration
Correct answer is A
Due to the presence of maximum Azeotrope,we use extractive distilination (with extractive distilation agents like sulfone) used for mixtures with low relative volatility,nearing unity.
Azeotrope is a mixture of liquids that has a constant boiling point because the vapour has thesame composition as the mixture.