Question:
Sulphide ion is soft base and its ores are common for metals.
(a) $\mathrm{Pb}$
(b) Al
(c) $\mathrm{Ag}$
(d) $\mathrm{Mg}$
Choose the correct answer from the options given below:
Correct Option: 1,
Solution:
$\mathrm{Pb}$ and Ag commonly exist in the form of sulphide ore like $\mathrm{PbS}$ (galena) and $\mathrm{Ag}_{2} \mathrm{~S}$ (Argentite)
'Al' is mainly found in the form of oxide ore whereas 'Mg' is found in the form of halide ore.
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