Question

Which of the following salts will not give positive brown ring test?

• A. $Cu(N{O}_3{)}_2$
• B. $Pb(N{O}_3{)}_2$
• C. $Zn(N{O}_3{)}_2$
• D. $Mg(N{O}_3{)}_2$

Answer 1

The correct option is B $Pb(N{O}_3{)}_2$

$Pb(N{O}_3{)}_2$ does not give brown ring test because $P{b}^{2+}$ forms insoluble sulphate ($PbS{O}_4$) with $H_{2}S{O}_4$ and hinders formation of brown ring.