Question

Which of the following gases are $B$ and $E$ respectively?

• A. $C{O}_2$ and $S{O}_2$
• B. $S{O}_2$ and $H_{2}S$
• C. $H_{2}S$ and $S{O}_2$
• D. $C{O}_2$ and $H_{2}S$

Answer 1

The correct option is C $H_{2}S$ and $S{O}_2$

$\underset{A,metalsulfide}{MS}+H_{2}S{O}_4\to \underset{B,colourless}{H_{2}S}\uparrow +\underset{C,colourlessmetalsulphate}{MS{O}_4}$
$K_{2}C{r}_2{O}_7+4H_{2}S{O}_4+\underset{B}{3H_{2}S}\to \underset{greensolution}{K_{2}S{O}_4+C{r}_2(S{O}_4{)}_3+7H_{2}O}+\underset{D,yellowprecipitate}{3S}$
$\underset{D}{S}+O_2\to \underset{E}{S{O}_2}\uparrow$.
$\underset{E}{S{O}_2}+\underset{B,colourless}{2H_{2}S}\to \underset{D}{3S}+2H_{2}O$.
$anhyd.CuS{O}_4+5H_{2}O\to \underset{blue}{CuS{O}_4.5H_{2}O}$