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The correct sequence of ligands in the order of decreasing field strength is :

1. CO > H 2 O > F – > S 2–
2. – OH > F – > NH 3 > CN –
3. NCS – > EDTA 4– > CN – > CO
4. S 2– > – OH > EDTA 4– > CO

Correct answer: CO > H 2 O > F – > S 2–

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