Ncert Exercises & Solutions

Hot conc. $H_{2} {SO}_{4}$ acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. $H_{2} {SO}_{4}$ into two gaseous products?

1.	Cu	2.	S
3.	C	4.	Zn

Hint: Metal does not give two types of gaseous products with H₂SO₄

H₂SO₄ is a moderately strong oxidizing agent which oxidizes both metals and non-metals as shown below

Cu + 2 H_{2} {SO}_{4} (conc) \to {CuSO}_{4} + {SO}_{2} + 2 H_{2} O

S + 2 H_{2} {SO}_{4} (conc) \to 3 {SO}_{2} + 2 H_{2} O

While carbon on oxidation with

H_{2} {SO}_{4}

produces two types of oxides

{CO}_{2}

and

{SO}_{2}

C + 2 H_{2} {SO}_{4} (conc) \to {CO}_{2} + 2 {SO}_{2} + 2 H_{2} O

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