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When a small piece of…..is dropped into ...

When a small piece of…..is dropped into a cold water, it reacts violently to form their hydroxides and_________

A

`Ca` , Oxygen gas

B

`Mg` , Hydrogen gas

C

`Na` , Hydrogen gas

D

Violet, `CuS0_(4).10H_(2)O` Green, `CoCl_(2).2H_(2)O`

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