Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?
Copper turnings
Copper (ll) trioxocarbonate (IV)
Copper (ll) oxide
Copper alloy
Explanation
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Cupper (ii) oxide reaction with h2s04 will give CuSO4 and H20 therefore no effervescence
Copper alloys are metal alloys that have copper as their principal component. They have high resistance against corrosion. The best known traditional types are bronze, where tin is a significant addition, and brass, using zinc instead.
Ahhh. myschool, what us this , the answer is A oooooo. not alloys o . alloys are typically unreactive. it can only react is there is a significant amount of copper in its composition, but still , the most suitable answer is copper turnings . Myschool please make corrections
The Chemistry of the Reaction
When Copper(II) oxide reacts with warm dilute sulfuric acid (H_2SO_4), a neutralization reaction occurs. The oxide is a base, and the acid produces a salt and water:
CuO(s) + H_2SO_4(aq) \rightarrow CuSO_4(aq) + H_2O(l)
The Blue Solution: The resulting copper(II) sulfate (CuSO_4) is responsible for the characteristic deep blue color of the solution.
No Effervescence: Effervescence (bubbling) is caused by the release of a gas. Since this reaction only produces water (H_2O), no gas is evolved, and the solution remains still.
Option Reaction Outcome Why it's wrong
(a) Copper alloy Varies by composition Most alloys contain metals that might react to produce hydrogen gas (effervescence).
(b) Copper turnings No reaction Copper is below hydrogen in the reactivity series; it does not react with dilute H_2SO_4 at all.
(d) CuCO_3 Blue solution + CO₂ gas While it creates a blue solution, the carbonate produces carbon dioxide, causing heavy effervescence.
