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How may of following are redox reactions...

How may of following are redox reactions:
-decomposition of magnesite.
- decomposition of potasium chlorate in presence of `MnO_(2)`…….
decomposition iron
- reaction of `F_(2)` with HBr.
- Reaction of `AgNO_(3)` with KCl to from silver chloride precipitate.

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The correct Answer is:
3
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