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In how many of the following reactions,...

In how many of the following reactions, one of the products is obtained is a black precipitate ?
i.`Bi(OH)_(3)darr+[Sn(OH)_(4)]^(2-)._((aq))rarr` Products
ii. `Bi^(3+) ._((aq)) + I^(Θ) ._((aq))` (not in excess) `rarr` Producets
iii. `Ag^(o+) ._((aq)) + H_(2)S_((g)) overset(H^(o+)) to ` Producets
iv. `[BiI_(4)]^(Θ)._((aq)) + H_(2)O_((I)) overset("Dilution") to ` Products

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The correct Answer is:
3
The following Reaction are
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