Question

Even in the absence of group II, colloidal yellowish ppt appears on passing $H_{2}S$ gas; it may be due to the presence of Oxidising agent (like ${SO}_3^{2-},{NO}_3^{-}$) .

If the given statement is true enter 1 else enter 0.

Answer 1

Even in the absence of group II, colloidal yellowish ppt appears on passing $H_{2}S$ gas; it may be due to the presence of oxidising agent (like ${SO}_3^{2-},{NO}_3^{-}$) which oxidizes sulphide ion of hydrogen sulphide to free sulphur.
$S^{2-}\stackrel{oxidizingagent}{\to }S\downarrow$