A common characteristic shared by iron and aluminium is that both?
are extracted by reduction methods
form only basic oxides
show oxidation states of +2 and +3
form soluble hydroxides
Correct answer is A
No explanation has been provided for this answer.
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.