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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc041

Which of the following formula-name pairs are correct according to IUPAC rules?

A $K X_{4} [Fe (CN) X_{6}]$ : potassium hexacyanidoferrate(II)
B $[Co (NH X_{3}) X_{6}] Cl X_{3}$ : hexaamminecobalt(II) chloride
C $[Ni (CO) X_{4}]$ : tetracarbonylnickel(0)
D $Na [Al (OH) X_{4}]$ : sodium tetrahydroxidoaluminate(III)

Answer: A, C, D

Fe in

[Fe (CN) X_{6}] X^{4 -}

is

+ 2

(correct). Co in

[Co (NH X_{3}) X_{6}] X^{3 +}

is

+ 3

, so 'cobalt(II)' is wrong. CO is neutral so nickel is 0 (correct). Al in

[Al (OH) X_{4}] X^{-}

is

+ 3

, and the anionic complex gives 'aluminate(III)' (correct).

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