When a substance A reacts with water it ...

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour a smokeless flame to Bunsen burner. A,B,C, and D respectively are `:`

`Na,H_(2) NaOH, Zn`

`K,H_(2) , KOH, Al`

`Ca, H_(2), Ca(OH)_(2) ,Sn`

`CaC_(2),C_(2)H_(2), Ca(OH)_(2),Fe`

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