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When a substance A reacts with water it ...

When a substance `A` reacts with water it produces a conbustible gas `B` and a solution of substance `C` in water. When another substance `D` reacts with this soution 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 tempreture. `A` imparts a golden yellow colour to a smokeless flame of bunsen flame. `A,B,C` and `D` are respectively.

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
b
`underset('A')(2Na)+2h_(2)O rarr underset('C')(2NaOH)+underset('B')(H_(2))`
`underset('D')(Zn)+underset('C')(2NaOH) rarr Na_(2)ZnO_(2)+underset('B')(H_(2))`
`underset('A')(Zn)+underset('C')(dil. H_(2)SO_(4))rarr ZnSO_(4)+underset('B')(H_(2))`
`Na` produce golden yellow colour with smokeless flame of Bunsen burner.
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