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A metal salt evolves the dark violet fumes of (X) with `MnO_(2)` and this (X) gives the deep blue colouration with starch solution. Then number of lone pair on central atom in (X).

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`3I^(-)+MnO_(2)+H_(2)SO_(4)to I_(3)^(-) uarr + Mn^(2+)+SO_(4)^(2-)+H_(2)S`
`I_(3)^(-) + "starch" to ` Blue color due to starch lodine complex
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