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Which of the following is a redox reacti...

Which of the following is a redox reaction ?

A

`CaCO _(3) to Ca O + CO _(2)`

B

`H _(2) + Cl _(2) to 2 HCl`

C

`Ca O + 2 HCl to Ca Cl _(2) + H _(2) O`

D

`Ca ( OH) _(2) + 2 HCl to Ca Cl _(2) + 2 H _(2) O`

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The correct Answer is:
B
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