Sulphide ion is soft base

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:

  1. (a) and (c) only

  2. (a) and $(d)$ only

  3. (a) and (b) only

  4. (c) and (d) only


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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