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For the given reaction, choose the correct expression of K C from the following. Fe 3+ (aq.) SCN – (aq.) (FeSCN) 2+ (aq.)

1. K c = ] FeSCN [ ] SCN [ ] Fe [ 2 3 + − +
2. K c = ] SCN [ ] Fe [ ] FeSCN [ 3 2 2 − + +
3. K c = 2 2 3 2 ] SCN [ ] Fe [ ] FeSCN [ − + +
4. K c = ] SCN [ ] Fe [ ] FeSCN [ 3 2 − + +

Correct answer: K c = ] SCN [ ] Fe [ ] FeSCN [ 3 2 − + +

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