Question

When a substance a reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substances D reacts with this solution of C . It also produce gas B on reaction with dilute sulphuric acid at room temperature . A imparts a deep golden yellow colour to the smokless 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

Substance A is Na.
`underset("A")(2Na) +2H_(2)O to underset("D")(2NaOH) +underset("B")(H_(2))`
Substances D is Zn.
`underset("D")(Zn)+2NaOH overset(Delta)to Na_(2)ZnO_(2) underset("B")(H_(2))`
`underset("D")(Zn)+underset("Dil.")(H_(2)SO_(4)) to ZnSO_(4) +underset("B")(H_(2))`