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. Substance (A) imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. Then (A), (B), (C) and (D) respectively are

(a) Ca, H₂, Ca(OH)₂, Sn

(b) K, H₂, KOH, Al

(c) Na, H₂, NaOH, Zn

(d) CaC₂, C₂H₂, Ca(OH)₂, Fe

Answer 1

The correct option is: (c) Na, H₂, NaOH, Zn

Explanation:

Only 'Na' imparts golden colour to bunsen flame, therefore, A = Na, B = H₂, C = NaOH, D = Zn.