The solubility product of different sparingly soluble salts are
$1.$ $\mathrm{X}\mathrm{Y}=4\times 10^{-20}$
$2.$ ${\mathrm{X}}_2\mathrm{Y}=3.2\times 10^{-11}$
$3.$ $\mathrm{X}{\mathrm{Y}}_3=2.7\times 10^{-31}$
The increasing order of solubility is

• Correct answer
  A

  1, 3, 2
• B

  2, 1, 3
• C

  1, 2, 3
• D

  3, 1, 2

Hence, the correct answer is option: 'A'.