11th Class Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन

  • question_answer 35)
        A number of elements are available in earth's crust but most abundant elements are.............. (a) Al and Fe                       (b) Al and Cu (c) Fe and Cu                      (d) Cu and Ag

    Answer:

                        (a) Among a number of elements which are available in earth crust, the most abundant elements are aluminum and iron. Aluminum is third most abundant element in earth crust, i.e., 8.3% by weight while iron present in earth crust witrr4.2% by weight. Copper and silver are also found in earth crust but their abundance percentage is low.


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