Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry

Question

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in its oxide. The fraction of the metal which exists as M3+ would be:

  • 7.01%

  • 4.08%

  • 6.05%

  • 5.08%

Answer

B.

4.08%

Metal oxide = M0.98O
If ‘x’ ions of M are in +3 state, then
3x + (0.98 – x) × 2 = 2
x = 0.04
So the percentage of metal in +3 state would befraction numerator 0.04 over denominator 0.98 end fraction space straight x 100 space equals space 4.08 percent sign

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