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12th Class Biology Reproduction In Organisms

  • question_answer 39)
      Which of the following is used for dissolution of gold?                 (a) Hydrochloric acid       (b) Sulphuric acid             (c) Nitric acid                      (d) Aqua-regia        

    Answer:

      (d) Aqua-regia is used for the dissolution of gold. Gold dissolves only in aqua-regia. Aqua-regia is a mixture of cone, HN03 and cone. HCI in the ratio 1 : 3. Aqua-regia= []


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