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NEET 2012

Exam: NEET
Year: 2012
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

NEET 2012 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Sulphur trioxide can be obtained by which of the following reaction

Sulphur trioxide can be obtained by which of the following reaction

Options

A $\mathrm{CaSO}_4+\mathrm{C} \stackrel{\Delta}{\longrightarrow}$
B $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3 \stackrel{\Delta}{\longrightarrow}$
C $\mathrm{S}+\mathrm{H}_2 \mathrm{SO}_4 \stackrel{\Delta}{\longrightarrow}$
D $\mathrm{H}_2 \mathrm{SO}_4+\mathrm{PCl}_5 \stackrel{\Delta}{\longrightarrow}$

Correct answer

B. $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3 \stackrel{\Delta}{\longrightarrow}$

Step-by-step solution

\text{(a) } \mathrm{CaSO}_4+\mathrm{C} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{SO}_2+\mathrm{CO}

(b)

\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3 \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{SO}_3

(c)

\mathrm{S}+2 \mathrm{H}_2 \mathrm{SO}_4 \stackrel{\Delta}{\longrightarrow} 3 \mathrm{SO}_2+2 \mathrm{H}_2 \mathrm{O}

(d)

\mathrm{H}_2 \mathrm{SO}_4+\mathrm{PCl}_5 \stackrel{\Delta}{\longrightarrow} \mathrm{SO}_3 \mathrm{HCl}+\mathrm{POCl}_3+\mathrm{HCl} \mathrm{SO}_3 \mathrm{HCl}

is chloro sulphonic acid Thus,

\mathrm{SO}_3

is obtained by heating

\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3

.

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