1)
the element oxidized: Si
the element reduced: F
the oxidizing agent: F2
the reducing agent: Si
2) the reaction proceeds in the opposite direction
the element oxidized: Hg
the element reduced: F
the oxidizing agent: F2
the reducing agent: Hg
3)
the element oxidized: C
the element reduced: Cr
the oxidizing agent: Cr3+
the reducing agent: H2C2O4
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