…………….is a decomposition reaction....

`…………….`is a decomposition reaction.

A

`CaCO_(3)overset(Delta)rarrCaO+Co_(2)`

B

`H_(2)O+CO_(2)rarrH_(2)CO_(3)`

C

`CaS+2HClrarrCaCl_(2)+H_(2)S`

D

`2H_(2)+O_(2)rarr2H_(2)O`

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The correct Answer is:

A

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