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Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a...

Chemistry
WAEC 2001

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

  • A. Copper turnings
  • B. Copper (ll) trioxocarbonate (IV)
  • C. Copper (ll) oxide
  • D. Copper alloy
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Correct Answer: Option A
Explanation

Copper turnings will dissolve in warm dilute sulfuric acid (H2SO4) without effervescence to give a blue solution.

When copper reacts with sulfuric acid, it forms copper sulfate (CuSO4), a salt that is blue in color. The reaction is: 

  • Cu (s) + H2SO4 (aq) → CuSO4 (aq) + H2 (g) ↑ 
  • Copper + Sulfuric acid → Copper sulfate + Hydrogen
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