Q3 / 160 · TS EAMCET 2007 · Chemistry

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

  • A
    $\mathrm{Ag}_2 \mathrm{~S}_2 \mathrm{O}_3$
  • B
    $\mathrm{Ag}_2 \mathrm{~S}$
  • Correct answer
    C
    $\mathrm{Na}_3\left[\mathrm{Ag}\left(\mathrm{S}_2 \mathrm{O}_3\right)_2\right]$
  • D
    $\mathrm{Ag}_3\left[\mathrm{Na}\left(\mathrm{S}_2 \mathrm{O}_3\right)_2\right]$

Solution

When sodium thiosulphate solution is added to $\mathrm{AgBr}$, then sodium argentothiosulphate is obtained. $\begin{aligned} & \mathrm{AgBr}+2 \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3 \longrightarrow \mathrm{Na}_3\left[\mathrm{Ag}\left(\mathrm{S}_2 \mathrm{O}_3\right)_2\right] \\ & \text { (colourless) } \\ & \text { sodium argentothiosulphate } \\ & +\mathrm{NaBr} \\ & \end{aligned}$

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

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