A substance A reacts with water, producing a combustible gas B and a solution of substance C. Substance D reacts with the solution of C and produces the same gas B. D also produces gas B on reaction with dilute H₂SO₄. A imparts a deep golden yellow colour to a flame. A, B, C, and D, respectively, are:
Correct answer: A. Na, H2, NaOH, Zn
- A. Na, H2, NaOH, Zn
- B. K, H2, KOH, Al
- C. Ca, H2, Ca(OH)2, Sn
- D. CaC2, C2H2, Ca(OH)2
Explanation
The golden yellow flame test identifies A as Sodium (Na). Na reacts with water to produce H₂ gas (B) and NaOH solution (C). Zinc (D) is an amphoteric metal that reacts with both NaOH and H₂SO₄ to produce H₂ gas.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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