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 `:`A. `Na,H_(2),NaOH, Zn`B. `K,H_(2),KOH,Al`C. `Ca,H_(2),Ca(OH)_(2),Sn`D. `CaC_(2),C_(2)h_(2),Ca(OH)_(2),Fe`

When a substance A reacts with water it produces a combustible gas B a

1.	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 `:`A. `Na,H_(2),NaOH, Zn`B. `K,H_(2),KOH,Al`C. `Ca,H_(2),Ca(OH)_(2),Sn`D. `CaC_(2),C_(2)h_(2),Ca(OH)_(2),Fe`
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