Question

Gas ${}^{\prime }{X}^{\prime }$ is evolved during the photochemical decomposition of $AgCl$. When gas ${}^{\prime }{X}^{\prime }$ is made to react with dry slaked lime, a compound ${}^{\prime }{Y}^{\prime }$ is formed along with water. Identify gas ${}^{\prime }{X}^{\prime }$ and compound ${}^{\prime }{Y}^{\prime }$.

• A. $X\to C{l}_2$
  $Y\to CaOC{l}_2$
• B. $X\to O_2$
  $Y\to CaC{l}_2$
• C. $X\to C{l}_2$
  $Y\to CaO$
• D. $X\to C{l}_2$
  $Y\to A{g}_{2}O$

Answer 1

The correct option is A $X\to C{l}_2$

$Y\to CaOC{l}_2$
$X\to C{l}_2$
$Y\to CaOC{l}_2$
Silver chloride on exposure to light turns black due to the formation of metallic silver.The reaction is represented by the chemical equation :
$2AgCl\left(s\right)+Sunlight\to 2Ag\left(s\right)+C{l}_2\left(g\right)$
The gas (X) released is $C{l}_2\left(g\right)$.

When dry $C{l}_2$ gas is passed over the dry slaked lime i.e. $Ca(OH{)}_2$ , calcium hypochlorite is formed along with water. The chemical formula of calcium hypochlorite is $CaOC{l}_2$(Y).