JEE Main2018ChemistryCoordination CompoundsActual
The oxidation states of Cr in Cr H 2 O 6 Cl 3 , Cr C 6 H 6 2 and K 2 Cr CN 2 O 2 O 2 NH 3 , respectively, are:
Options
- A+ 3 , 0 and + 4
- B+ 3 , + 4 and + 6
- C+ 3 , + 2 and + 4
- D+ 3 , 0 and + 6
Correct answer
D. + 3 , 0 and + 6
Step-by-step solution
(i) Cr H 2 O 6 Cl 3 : Hexaaquachromium III chloride x + 6 × 0 + - 1 × 3 = 0 x = + 3 (ii) Cr C 6 H 6 2 : bis   η 6 - benzene chromium 0 y + 2 × 0 = 0 y = 0 (iii) K 2 Cr CN 2 O 2 O 2 NH 3 : Potassium amminedicyanido dioxide peroxide chromate VI 2 × 1 + z + 2 × - 1 + 2 × - 2 + - 2 + 0 = 0 z = + 6 The oxidation states of Cr in Cr H 2 O 6 Cl 3 ,   Cr C 6 H 6 2 and K 2 Cr CN 2 O 2 O 2 NH 3 , respectively, are + 3 ,   0 and + 6 .