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 metal that will react with water only in the form of steam to librate hydrogen gas is?
calcium
aluminium
iron
zinc
Correct answer is C
No explanation has been provided for this answer.
A gas is evolved
A deep blue precipitate is formed
The resultant solution turns green turns
A brown precipitate is formed
Correct answer is D
Iron(III) chloride is a yellow solution
sodium hydroxide is colourless
iron(III) hydroxide is a reddish brown precipitate
sodium chloride is colourless
So in the reaction, yellow solution when added to sodium hydroxide forms reddish brown precipitate that is insoluble in excess sodium hydroxide.
The oxide that remains unchanged when heated in hydrogen is?
CuO
Fe2O3
PbO2
ZnO
Correct answer is D
Zinc oxide doesn't react to hydrogen gas because the reaction is not spontaneous.
HNO 3 but soluble in ammonia solution
HNO3 and ammonia solution
HCl but soluble in ammonia solution
HCl and in ammonia solution
Correct answer is A
No explanation has been provided for this answer.
basic properties of ammonia
acidic properties of ammonia
reducing properties of ammonia
oxidizing properties of ammonia
Correct answer is C
No explanation has been provided for this answer.