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Question

What happens when:
i) CuSO4(aq)+Fe(s)?
ii) Zn(s)+H2SO4(l)?
iii) Na(s)+O2(g)?

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Solution

(i) It is a displacement reaction. It is as follows : CuSO4(aq)+2Fe(s)Fe2(SO4)3+3Cu(s)
(ii) Zinc reacts with dilute sulphuric acid to give zinc sulphate with the evolution of hydrogen gas. The reaction is as follows: Zn+H2SO4ZnSO4+H2
(iii) Small pieces of sodium burn in the air with often little more than an orange glow. Using larger amounts of sodium or burning it in oxygen gives a strong orange flame. A white solid mixture of sodium oxide and sodium peroxide is formed.

The equation for the formation of oxide is:.

4Na+O22Na2O

The peroxide equation is:

2Na+O2Na2O2


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