(1) HCl(aq)
(2) FeO•Fe2O3(s)
(3) CuSO4•5H2O(s)
A. (1) only
B. (1) and (2) only
C. (2) and (3) only
D. (1), (2) and (3)
2. Which of the following atoms are the most abundant considering the whole earth by mass?
A. Iron
B. Aluminium
C. Oxygen
D. Nitrogen
更新1:
please 詳細解釋
更新2:
俾既ans係c同a= = 係咪ans錯??