Some Basic Concepts of Chemistry (Quiz)

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Q.1 10mL of 0.2 N HCl and 30mL of 0.1 N HCl together exactly neutralise 40mL of solution of NaOH, which is also exactly neutralised by a solution in water of 0.61g of an organic acid. What is the equivalent weight of the organic acid?
  61
  91.5
  122
  183