Carbon exist naturally in the combined state as?
graphite
coal
diamond
wood
Correct answer is D
Carbon exists in the combined state as petroleum, wood and natural gases.
The group IA metals are not found free in nature because they
are very reactive and unstable
are malleable and ductile
have high melting and boiling point
conduct heat and electricity
Correct answer is A
No explanation has been provided for this answer.
Ca(NO3)2
Cu(NO3)2
AgNO3
NaNO3
Correct answer is C
AgNO3 → 2Ag + O2 + 2NO2
The raw materials used for the smelting of iron ore in a furnace is
CaSO4
CaCO3
CuSO4
Zn(NO3)2
Correct answer is B
No explanation has been provided for this answer.
To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be
passed over heated copper (II) oxide
bubbled through water
bubbled through concentrated tetroxosulphate (VI) acid
bubbled through sodium hydroxide
Correct answer is D
No explanation has been provided for this answer.