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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn050

Select the pairs in which the IUPAC Stock name correctly states the oxidation number of the central metal.

A $K X_{4} [Fe (CN) X_{6}]$ : potassium hexacyanidoferrate(II)
B $Na X_{2} Cr X_{2} O X_{7}$ : sodium dichromate(VI)
C $K X_{3} [Fe (CN) X_{6}]$ : potassium hexacyanidoferrate(II)
D $K X_{2} MnO X_{4}$ : potassium manganate(VI)

Answer: A, B, D

K X_{2} MnO X_{4}

:

2 + x - 8 = 0

gives Mn

+ 6

.

Na X_{2} Cr X_{2} O X_{7}

:

2 + 2 x - 14 = 0

gives Cr

+ 6

.

K X_{4} [Fe (CN) X_{6}]

:

4 + x - 6 = 0

gives Fe

+ 2

.

K X_{3} [Fe (CN) X_{6}]

:

3 + x - 6 = 0

gives Fe

+ 3

, so the name with (II) is wrong for this salt.

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