Question

Match the reaction in List-1 based on precipitate obtained as one of the products in List-2.

Answer 1

(A) Mercuric ions reacts with iodide ions to form red ppt of mercuric iodide.
$H{g}_{\left(aq\right)}^{2+}+I_{\left(aq\right)}^{-}⟶Hg{I}_2\downarrow \left(\text{Red ppt.}\right)$
(B) Cupric ions reacts with ferrocyanide ion to form brown ppt of cupric ferrocyanide.
$2C{u}_{\left(aq\right)}^{2+}+\left[Fe\right(CN{)}_6{]}_{\left(aq\right)}^{4-}⟶C{u}_2\left[Fe\right(CN{)}_6]\downarrow (\text{Brown ppt.})$
(C) Magnesium ions react with hydrogen phosphate ions in presence of ammonia to form white ppt of magnesium ammonium phosphate.
$M{g}_{\left(aq\right)}^{2+}+N{H}_{3\left(aq\right)}+HP{O}_{4\left(aq\right)}^{2-}⟶MgN{H}_{4}P{O}_4\downarrow \left(\text{White}\right)$
(D) Lead (II) ions reacts with chromate ions to form yellow ppt of lead chromate.
$P{b}_{\left(aq\right)}^{2+}+Cr{O}_{4\left(aq\right)}^{2-}⟶PbCr{O}_4\downarrow \left(\text{Yellow}\right)$