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JEE Main levelSingle correct optionDifficulty 2 of 3cc059

The formula of pentaamminenitrito-N-chromium(III) sulfate is

A $[Cr (NH X_{3}) X_{4} (NO X_{2})] SO X_{4}$
B $[Cr (NH X_{3}) X_{5} (NO X_{2})] SO X_{4}$
C $[Cr (NH X_{3}) X_{5} (NO X_{2})] X_{2} SO X_{4}$
D $[Cr (NH X_{3}) X_{5} (NO X_{2})] (SO X_{4}) X_{2}$

Answer: B

The cation contains Cr(III), five neutral NH3 and one nitrite (

- 1

), so its charge is

+ 3 - 1 = + 2

. One sulfate (

2 -

) balances it, giving 1:1. The other options have wrong ligand numbers or wrong cation:anion ratios.

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