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Q.

Platinum dissolves in aqua regia to form a soluble complex and an oxide of nitrogen ‘X’ . Oxidation state and coordination number of platinum in the complex formed is

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a

+4, 4

b

+2, 6

c

+4, 6

d

+2, 4

answer is A.

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Detailed Solution

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$3 Pt + 16 H^{+} + 4 {NO}_{3}^{-} + 18 {Cl}^{-} \to 3 {[{PtCl}_{6}]}^{2 -} + 4 NO + 8 H_{2} O$

oxidation number of pt = +4

coordination number of pt = 6

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