A solution containing a period$-\mathrm{IV}$ cation gives a precipitate on passing ${\mathrm{H}}_2\mathrm{S}.$ A solution of this precipitate in dil. $\mathrm{HCl}$produces a white precipitate with $\mathrm{NaOH}$ solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is

• A

  ${\mathrm{Mn}}^{2+}$
• Correct answer
  B

  ${\mathrm{Zn}}^{2+}$
• C

  ${\mathrm{Ni}}^{2+}$
• D

  ${\mathrm{CO}}^{2+}$

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