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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 also produce gas B on rection with dilute sulphuric acid at room with dilute sulphuric acid at room temperature. A imparts a deep flameof yellow colour to a smokeless flame of Bunesen burner. A,B,C and D, respectively are

A

`Na, H_(2), NaOH and Zn`

B

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

C

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

D

`CaC_(2), C_(2)H_(2), Ca(OH)_(2) and Sn`

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The correct Answer is:
A
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