copper
zinc
calcium
lead
Correct answer is A
No explanation has been provided for this answer.
Aluminium is extracted commercially from its ore by?
heating aluminium oxide with coke in a furance
the electrolysis of fused aluminium oxide in cryolite
treating cryolite with sodium hydroxide solution under prressure
heating sodium aluminium silicate to a high temperature
Correct answer is B
No explanation has been provided for this answer.
Chlorine is produced commmercially by?
electrolysis of dilute hydrochloric acid
electrolysis of brine
neutralization of hydrogen chloride
heating potassium trioxochlorate (V)
Correct answer is B
No explanation has been provided for this answer.
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and?
nitrogen (ll) oxide
nitrogen (l) oxide
nitrogen (lV) oxide
nitrogen
Correct answer is C
No explanation has been provided for this answer.
Suitable reagents for the laboratory preparation nitrogen are?
sodium dioxonitrate (III) and ammonium chloride
sodium dioxonitrate (V) and ammonium chloride
sodium chloride and ammonium chloride
sodium chloride and ammonium diozonitrate (III)
Correct answer is A
No explanation has been provided for this answer.