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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc063

The diamagnetic complex $Na X_{2} [Fe (CN) X_{5} (NO)]$ is named by treating NO as $NO X^{+}$ . Its IUPAC name is

Asodium pentacyanidonitrosylferrate(III)
Bsodium pentacyanidonitrosylferrate(II)
Csodium nitrosylpentacyanidoferrate(II)
Ddisodium pentacyanidonitrosylferrate(II)

Answer: B

Anion charge is

- 2

:

x + 5 (- 1) + (+ 1) = - 2

gives

x = + 2

. Fe(II)

d^{6}

with strong-field ligands is low spin, which agrees with diamagnetism. Alphabetical order puts cyanido before nitrosyl, and an anionic complex uses ferrate.

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