M.C.Q.: Choose the correct answer(s) 📝🌬️
🇫🇷 French Version
1.
Dry air mainly contains:
dioxygen (O
2
) and carbon dioxide (CO
2
)
dioxygen (O
2
) and dinitrogen (N
2
)
dioxygen (O
2
) and water
2.
The volume proportion of dioxygen (O
2
) in dry air is:
1/4
1/5
3/4
15 %
20 %
50 %
3.
To prepare 20 L of dry air, you need:
4 L of dioxygen (O
2
) and 16 L of dinitrogen (N
2
)
5 L of dioxygen (O
2
) and 15 L of dinitrogen (N
2
)
10 L of dioxygen (O
2
) and 20 L of dinitrogen (N
2
)
4.
When exhaling, we release:
dinitrogen (N
2
)
dioxygen (O
2
)
carbon dioxide (CO
2
)
5.
Dry air contains:
molecules
extremely small constituents
constituents that pass through a sheet of paper
6.
The carbon dioxide (CO
2
) detector is:
limewater
hot water
anhydrous copper(II) sulfate
📊 RESULT:
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