Question

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. `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`

Answer 1

Correct Answer - a
`2Na_((s))+2H_(2)O_(l)rarr 2NaOH_((aq))+H_(2(g))`
`(A)` `(C)` `(B)`
`Zn_((s))+2NaOH_((aq)) rarr Na_(2)ZnO_(2)+H_(2)(B)`
`(D)`
`Zn_((s))+H_(2)SO_(4(aq))overset("Room temperature")rarrZnSO_(4(aq))+H_(2)(B)`,
`(D)`
`Na overset("Burn on nonlumionous flame")rarr`Golden yellow flame