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

Options

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 Fe.

Answer

A

Explanation

`{:(2Na+2H_(2)Orarr,2NaOH,+H_(2),),((A),(C ),(B),),(2NaOH+Znrarr,Na_(2)ZnO_(2),+H_(2),),((C )" (D)",,(B),):}`
Na(A) imparts a golden yellow colour to the flame.