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Which one of the following combines with `Fe(II)` ions to form a brown complex ?

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Which one of the following combines with `Fe(II)` ions to form a brown complex ?
A. `N_(2)O`
B. `NO`
C. CO
D. `SO_(2)`
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Correct Answer - B
`Fe^(2+) + NO + 5H_(2)O rarr [Fe(H_(2)O)_(5) NO]^(2+)` (brown complex)
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