Q9 / 160 · AP EAMCET 2023 (16 May Shift 2) · Chemistry

Observe the following reaction $\mathrm{xS}_8(\mathrm{~s})+\mathrm{yOH}^{-}(\mathrm{aq}) \rightarrow \mathrm{zS}^{2-}(\mathrm{aq})+2 \mathrm{~S}_2 \mathrm{O}_3^{2-}(\mathrm{aq})$ $+6 \mathrm{H}_2 \mathrm{O}(1) \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively.

  • Correct answer
    A
    $1,12,4$
  • B
    $1,12,2$
  • C
    $1,4,12$
  • D
    $2,12,2$

Solution

The balanced equation is:- $\begin{aligned} & \mathrm{S}_8(\mathrm{~s})+12 \mathrm{OH}^{-} \text {(aq.) } \rightarrow \\ & 4 \mathrm{~S}^{2-}(\mathrm{aq})+2 \mathrm{~S}_2 \mathrm{O}_3{ }^{2-}(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \\ & \end{aligned}$ Thus, $\mathrm{x}=1, \mathrm{y}=12$ and $\mathrm{z}=4$

Hence, the correct answer is option: 'A'.

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