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A metal salt evolves the dark violet fum...

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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The correct Answer is:
3
`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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Knowledge Check

  • The number of lone pairs on central atom in XeF_2, XeF_4 and XeF_6 are:

    A
    (A) 1,2,3
    B
    (B) 3,2,1
    C
    (C) 2,2,1
    D
    (D) 1,3,2

  • The acidic solution of a salt produced a deep blue colour with starch iodine solution. The salt may be

    A
    chloride
    B
    nitrite
    C
    acetate
    D
    bromide

  • The ratio of number of lone pairs on central atom in ammonia, Water and XeF_2 are

    A
    `3 : 2 :1`
    B
    `2 : 1 : 3`
    C
    `1 : 2 : 3`
    D
    `2 : 3 :1`

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