Which of the following is not a transition metal complex?

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Which of the following is not a transition metal complex? Answer: K2Cr2O7

K₂Cr₂O₇ (Potassium dichromate) is an ionic compound, not a coordination complex. It contains the Cr₂O₇²⁻ ion, where chromium atoms are connected through oxygen atoms, not through ligands. Therefore, it’s not a transition metal complex.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.