The soft solder used for welding and plumbing is alloy of
lead and tin
iron and tin
lead and zinc
iron and zinc
Correct answer is A
No explanation has been provided for this answer.
trioxonitrate (V)
chloride
trioxocarbonate (IV)
hydroxide
Correct answer is C
No explanation has been provided for this answer.
When calcium oxide is heated with carbon, the oxide will
be converted to carbide
be converted to the trioxocarbonate (IV) salt
decompose to the metal
melt,producingg carbon (IV) oxide
Correct answer is A
No explanation has been provided for this answer.
An element used in the production of matches is
nitrogen
aluminium
copper
sulphur
Correct answer is D
No explanation has been provided for this answer.
purple solution
purple precipitate
colourless precipitate
colourless solution
Correct answer is D
No explanation has been provided for this answer.