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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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3Pt+16H++4NO3-+18Cl- →3PtCl62-+4NO+8H2O

oxidation number of pt = +4 

coordination number of pt = 6

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