A light greenish coloured salt was soluble in water. On passing into the solution in the presence of a base, a black precipitate was obtained which dissolved readily in . The metal ion present is
As we have learnt,
salts are green in colour. Upon reaction with in alkaline medium, it forms a black precipitate of which dissolves upon addition of .
It is to be noted that the precipitation does not take place in acidic solution because the is not sufficient to cause precipitation.
Hence, the correct answer is Option (2)
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