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Which one of the following complex ions has geometrical isomers?

• (a)$[\text{Ni}(\text{NH}_3)_5\text{Br}]^+$
• (b)$[\text{Cr}(\text{NH}_3)_4\text{en}]^{3+}$
• (c)$[\text{Co}(\text{NH}_3)_2(\text{en})_2]^{3+}$
• (d)$[\text{Co}(\text{NH}_3)_6]^{3+}$

Answer

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From ISC 2025 Specimen Chemistry Paper 1, question 1(B)(v).