A mixture of two salts is used to prepare a solution \( \mathrm{S} \), which gives the following...

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A mixture of two salts is used to prepare a solution \( \mathrm{S} \), which gives the following results:
The correct option(s) for the salt mixture is/are.
(a) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \) and \( \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2} \)
(b) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \) and \( \mathrm{Bi}\left(\mathrm{NO}_{3}\right)_{2} \)
(c) \( \mathrm{AgNO}_{3} \) and \( \mathrm{Bi}\left(\mathrm{NO}_{3}\right)_{3} \)
(d) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \) and \( \mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2} \)
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