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.
Detergents are better than soaps for washing in hard water because
hard water contains insoluble calcium salts.
they contain bleaching powder.
they contain palmitic acid.
they do not form insoluble calcium and magnesium salts.
they are organic compounds.
Correct answer is D
No explanation has been provided for this answer.
Which method is NOT used to determine rate of a reaction?
change in amount of precipitate formed
change in equilibrium constant
change in intensity of colour
change in pH values.
change in total gas pressure
Correct answer is B
No explanation has been provided for this answer.
boiling off the ethanoic
filtration
fractional crystallisation
fractional distillation
isomerisation
Correct answer is D
No explanation has been provided for this answer.
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
Ba(NO3)2(aq) then HNO3(aq).
HCl(aq) then Ba(NO3)2(aq).
HCl(aq) then Ag3(aq).
HNO3(aq) then fresh FeSO4(aq).
HNO3(aq) then AgNO3(aq).
Correct answer is E
No explanation has been provided for this answer.
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
NaCl(s) is non-ionic but NaCl(aq) is ion
NaCl(aq) contains mobile electrons, where absent in NaCl(s).
NaCl(aq) contains mobile ions which Nacl,) does not contain.
NaCl(s) ionizes partiality while NaCl(aq) iodizes completely.
NaCl(s) decomposes when heated but NCl(aq) is stable to heat.
Correct answer is C
No explanation has been provided for this answer.