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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 produce `B` on reaction with dilute sulphuric acid at room temperature. `B` on reaction with dilute sulphuric acid at room temperature. `A` imparts a golden yellow colour to a smokeless flame of Bunsen flame. `A,B,C` and `D` are respectively.

A

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

B

`K, H_(2), KOH" and "Zn`

C

`K,H_(2),NaOH" and "Zn`

D

`Ca,H_(2)O,Ca(OH)_(2)" and "Zn`

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The correct Answer is:
A
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