MCQ
Acidity of diprotic acids in aqueous solutions increases in the order
- ✓$H_2S < H_2Se < H_2Te$
- B$H_2Se < H_2S < H_2Te$
- C$H_2Te < H_2S < H_2Se$
- D$H_2Se < H_2Te < H_2S$
✓
Answer
Correct option: A.
$H_2S < H_2Se < H_2Te$
a
Peroxydisulfuric acid is the inorganic compound with the chemical formula $\mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{8}$.
Peroxydisulfuric acid is the inorganic compound with the chemical formula $\mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{8}$.
It contains sulfur in its +6 oxidation state and a peroxide group.
The tetrathionate anion, $\mathrm{S}_{4} \mathrm{O}_{6}^{2-}$, is a sulphur oxoanion derived from the compound tetrathionic acid, $\mathrm{H}_{2} \mathrm{S}_{4} \mathrm{O}_{6}$.
Two of the sulphur atoms present in the ion are in oxidation state $\mathrm{O}$ and two are in oxidation state $+5 .$
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{(2){\kern 1pt} A{g_2}O/{H_2}O} \\
{(3){\kern 1pt} \Delta }
\end{array}}]{{(1){\kern 1pt} \,excess\,{\kern 1pt} C{H_3}I/{K_2}C{O_3}}}(B)$ $\xrightarrow[{(iii){\kern 1pt} \Delta }]{{\begin{array}{*{20}{c}}
{(i){\kern 1pt} excess{\kern 1pt} C{H_3}I/{K_2}C{O_3}} \\
{(ii){\kern 1pt} A{g_2}O}
\end{array}}}$ $\begin{array}{*{20}{c}}
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{|{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \,\,\,\,\\
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\end{array}$
→{(2){\kern 1pt} A{g_2}O/{H_2}O} \\
{(3){\kern 1pt} \Delta }
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{(i){\kern 1pt} excess{\kern 1pt} C{H_3}I/{K_2}C{O_3}} \\
{(ii){\kern 1pt} A{g_2}O}
\end{array}}}$ $\begin{array}{*{20}{c}}
{{H_2}C = CH - CH - CH = C{H_2}} \\
{|{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \,\,\,\,\\
{{\mkern 1mu} {\mkern 1mu} C{H_3}}
\end{array}$
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→