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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 reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are

1. Na, H2, NaOH, Zn
2. K, H2, KOH, Al
3. Ca, H2, Ca(OH)2, Sn
4. CaC2, C2H2, Ca(OH)2, Fe

Correct answer: Na, H2, NaOH, Zn

Solution

Substance A is sodium (Na), which reacts with water to produce hydrogen gas (B) and sodium hydroxide (C). Zinc (D) reacts with sodium hydroxide to release hydrogen gas. Sodium imparts a golden yellow color to a flame, confirming the identification.

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