Sulphide ion is soft base and its ores are common for metals
(a) Pb (b) Al (c ) Ag (d) Mg
Choose the correct answer the from the options given below:

Options

A. (A) and (C) only
B. (A) and (B) only
C. (A) and (D) only
D. (C) and (D) only

Answer

A

Explanation

Pb and Ag commonly exist in the form of sulphide ore like PbS (galena) and `Ag_(2)S` (Argentite)
Al' is mainly found in the form of oxide ore whereas ' Mg' is found in the form of halide ore.