When a substance 'A' reacts with water i...

When a substance 'A' reacts with water it produces combustible gas B and a solution of a substance 'C' in water . A has no reaction with the solution of 'C' When another substance 'D' reacts with this solution of 'C' it also produces the same gas 'B' even on reaction with dilute sulphuric acid at room temperature . Here A,B,C and D or respectively.

`Na,H_2 , NaOH and Zn`

`K,H_2,KOH and Na`

`Ca,O_(2),Ca(OH)_2` and Sn

`"Cal"_2, C_2H_2Ca(OH)_2 and Fe`

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