JEE MAIN - Chemistry (2006 - No. 32)
Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?
NaCl + H2SO4 $$\to$$ NaHSO4 + HCl
2PCl5 + H2SO4 $$\to$$ 2POCl3 + 2HCl + SO2Cl2
2HI + H2SO4 $$\to$$ I2 + SO2 + 2H2O
Ca(OH)2 + H2SO4 $$\to$$ CaSO4 + 2H2O
Explanation
$$2H{I^{ - 1}} + {H_2}\mathop {S{O_4}}\limits^{ + 6} \to I_2^0 + \mathop {S{O_2}}\limits^{ + 4} + 2{H_2}O$$
in this reaction oxidation number of $$S$$ is decreasing from $$+6$$ to $$+4$$ hence undergoing reduction and for $$HI$$ oxidation Number of $$I$$ is increasing from $$-1$$ to $$0$$ hence undergoing oxidation therefore $${H_2}S{O_4}$$ is acting as oxidising agent.
in this reaction oxidation number of $$S$$ is decreasing from $$+6$$ to $$+4$$ hence undergoing reduction and for $$HI$$ oxidation Number of $$I$$ is increasing from $$-1$$ to $$0$$ hence undergoing oxidation therefore $${H_2}S{O_4}$$ is acting as oxidising agent.
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