Which pair of aqueous solutions

CHEMISTRY · Single correct · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

Which pair of

0.10\,\text{M}

aqueous solutions, when mixed in equal volumes at

25\,^{\circ}\text{C}

, is least likely to produce a precipitate? (a)

\mathrm{AgNO_3}

(aq) and

\mathrm{Na_3PO_4}

(aq) (b)

\mathrm{NaNO_3}

(aq) and

\mathrm{KBr}

(aq) (c)

\mathrm{CaCl_2}

(aq) and

\mathrm{Na_2CO_3}

(aq) (d)

\mathrm{Pb(NO_3)_2}

(aq) and

\mathrm{KI}

(aq)