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  • _________ is formed when potassium iodide is heated with conc. <img alt="\mathrm{H}_{2} \mathrm{SO}_{4}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7BH%7D_%7B2%7D%20%5Cmathrm%7B

_________ is formed when potassium iodide is heated with conc. \mathrm{H}_{2} \mathrm{SO}_{4} in the presence of \mathrm{MnO_2}

Option: 1

\text{HI}


Option: 2

\text{I}_{2}


Option: 3

\mathrm{HIO}_{3}


Option: 4

\mathrm{KIO}_{3}


Answers (1)

best_answer

Iodide ions react with concentrated \mathrm{H_2SO_4} in the presence of \mathrm{MnO_2} to form dense violet fumes of \mathrm{I_2} as given below

\begin{array}{r} 2 \mathrm{KI}+\mathrm{MnO}_{2}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{I}_{2}+\mathrm{MnSO}_{4}+2 \mathrm{H}_{2} \mathrm{O} +2 \mathrm{KHSO}_{4} \end{array}

Hence, the correct answer is Option (2)

Posted by

Shailly goel

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