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  3. 9th Class
  4. Science

9th Class Science Sample Paper Science Olympiad Model Test Paper-15

  • question_answer
    Calculate the percentage of Cr in \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\][Atomic mass: \[K=39,\text{ }Cr=52,\text{ }O=16\]].

    A) 35.37%

    B) 34.39%

    C) 40.02%

    D) 42.35%

    E) None of these

    Correct Answer: A

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