Question

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 gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour a smokeless flame to Bunsen burner. A,B,C, and D respectively are `:`
A. `Na,H_(2),NaOH, Zn`
B. `K,H_(2),KOH, Al`
C. `CaH_(2), Ca(OH)_(2),Sn`
D. `CaC_(2),C_(2)H_(2), Ca(OH)_(2),Fe`

Answer 1

Correct Answer - A
Only Na gives golden colour to bunses flame. So, A is Na
`2Na + 2H_(2)O to 2NaOH + H_(2) uarr`
`Zn+2NaOH to Na_(2)ZnO_(2) + H_(2) uarr`
`Zn+"dil".H_(2)SO_(4) to ZnSO_(4) + H_(2) uarr`
Na, proudces golden yellow colour with smokeless flame of Bunsen burner.