If $1 \ mL$ of $10\% \ NaCl$ solution is added to $10 \ mL$ of gold sol containing $0.25 \ g$ of starch to prevent coagulation,what is the gold number of starch?

  • A
    $0.025$
  • B
    $0.25$
  • C
    $2.5$
  • D
    $250$

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