When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is:
Correct answer: A. 1 : 1
- A. 1 : 1
- B. 1 : 2
- C. 2 : 1
- D. 9 : 4
Explanation
The balanced chemical equations are Zn + H₂SO₄ → ZnSO₄ + H₂ and Zn + 2NaOH → Na₂ZnO₂ + H₂. In both cases, one mole of zinc produces one mole of hydrogen gas. Therefore, the ratio of the volumes of H₂ evolved is 1:1.
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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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