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Subjects
Science State Board
Class 7
Matter Around Us
Atoms, molecules, elements and compounds
4.
Answer the questions about atoms and molecules
Exercise condition:
2
m.
Choose the correct answer:
1
.
My chemistry teacher taught me that, if we mix salt with sand, at the end we'll get heterogeneous __________?
None of these
Compound
Ions
Atom
2
.
Nitrogen and oxygen are the constituent elements of the compound __________.
Ammonia
None of these
Nitrogen dioxide
Ammonium sulphide
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