UPSEE SERIES Chemistry
Laws Of Chemical Combinations
1 previous year questions.
Volume: 1 Ques
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1
2019 Chapter Questions 1 MCQs
01
PYQ 2019
easy
chemistry ID: upsee-20
Average atomic weight of an element M is 51.7. If two isotopes of and are present, then percentage of occurrence of in nature will be.
1
85%
2
15%
3
50%
4
100%