Q .     The decomposition of a certain mass of `CaCO_3` gave `11.2 dm^3` of `CO_2` gas at `S.T.P.` The mass of` KOH` required to completely neutralise the gas is :

AIIMS 2012
A

`56 g`

B

`28 g`

C

`42 g`

D

`20 g`

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