MolSynapsequestion bank

MolSynapse / Question bank / Ionic Equilibrium I / Common ion effect and precipitation

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ie218

Equal volumes of $AgNO X_{3}$ (conc. $a$ ) and $K X_{2} CrO X_{4}$ (conc. $b$ ) are mixed. $K_{s p} (Ag X_{2} CrO X_{4}) = 1.1 \times 1 0^{- 12}$ . Choose the correct statement(s).

A $a = 2.0 \times 1 0^{- 4} M$ , $b = 2.0 \times 1 0^{- 3} M$ : ionic product $= 1.0 \times 1 0^{- 11}$ and a precipitate forms
B $a = 1.0 \times 1 0^{- 4} M$ , $b = 4.0 \times 1 0^{- 4} M$ : a precipitate forms
C $a = 4.0 \times 1 0^{- 4} M$ , $b = 1.0 \times 1 0^{- 4} M$ : ionic product $= 2.0 \times 1 0^{- 12}$ and a precipitate forms
D $a = 1.0 \times 1 0^{- 3} M$ , $b = 4.0 \times 1 0^{- 6} M$ : a precipitate forms

Answer: A, C

After mixing both concentrations are halved, so ionic product

= (a /2)^{2} (b /2)

. The four cases give

1.0 \times 1 0^{- 11}

,

5.0 \times 1 0^{- 13}

,

2.0 \times 1 0^{- 12}

and

5.0 \times 1 0^{- 13}

. Only the first and third exceed

K_{s p} = 1.1 \times 1 0^{- 12}

.

Practice Ionic Equilibrium I More on Common ion effect and precipitation

Previous questionNext question

More questions on Common ion effect and precipitation