The relative abundance of two isotopes of atomic weight $85$ and $87$ is $75\%$ and $25\%$ respectively. The average atomic weight of the element is:
- A$75.5$
- B$85.5$
- C$40.0$
- D$86.0$
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Which one of the following properties of an element is not variable?
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|---|---|
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| $D. KMnO_4 / H_2O$ | $IV. M/6$ |
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