M (s) ?+ xH 2 SO 4(aq) \(\rightarrow\) M(SO 4 ) x(aq) ?+ xH 2(g)
CHEMISTRY
POST UTME OAU
M(s) ?+ xH2SO4(aq) \(\rightarrow\) M(SO4)x(aq) ?+ xH2(g) ?Which of the following elements will not undergo the above reaction?
- A) Zn
- B) Na
- C) Cu
- D) Ca
Correct Answer: C) Cu
Explanation
Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas is evolved. Sodium reacts with aqueous sulfuric acid to produce sodium sulfate and hydrogen. Calcium reacts with dilute sulphuric acid to give calcium sulfate and hydrogen gas.
Copper, on the other hand, does not react with dilute sulphuric acid (H\(_2\)SO\(_4\)(aq)) at all as Cu is less reactive than hydrogen. However, copper gets oxidised into copper sulphate by the action of conc. sulphuric acid along with the evolution of SO\(_2\) and water vapour.
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