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Identify the o0XIdant and reductant and ...

Identify the o0XIdant and reductant and the atoms undergoing o0XIdation and reduction in the following redox reactions.
`MnO_2+ 4HCl toMnCl_2 + Cl_2 + 2H_2O`

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a., Oxidised substance - .HCl.
b. Reduced substance .-MnO_2.
c. Oxidising agent .-MnO_2.
d. Reducing agent .-HCl.
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