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The ${K_{SP}}$ of $AgI$ is $1.5 \times {10^{ - 16}}$. On mixing equal volumes of the following solutions, precipitation will occur only with

• A
  ${10^{ - 7}}\,M\,A{g^ + }$ and ${10^{ - 19}}\,M\,{I^ - }$
• ✓
  ${10^{ - 8}}\,M\,A{g^ + }$and ${10^{ - 8}}\,M\,{I^ - }$
• C
  ${10^{ - 16}}\,M\,A{g^ + }$ and ${10^{ - 16}}\,M\,{I^ - }$
• D
  ${10^{ - 9}}\,M\,A{g^ + }$ and ${10^{ - 9}}\,M\,{I^ - }$