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What is the minimum concentration of $SO_4^{2 - }$ required to precipitate $BaS{O_4}$ in a solution containing $1.0 \times {10^{ - 4}}\,mol\,\,\,B{a^{2 + }}$ (${K_{sp}}$ for $BaS{O_4}$ is $4 \times {10^{ - 10}}$)

• A
  $4 \times {10^{ - 10}}\,M$
• B
  $2 \times {10^{ - 7}}\,M$
• ✓
  $4 \times {10^{ - 6}}\,M$
• D
  $2 \times {10^{ - 3}}\,M$