O-LevelChemistryChemistry of the Environment5070/11 · May/June 2020 · Q311 Mark
Which row correctly compares carbon dioxide and methane?
Aboth contain carbon: ✔, both are described as a greenhouse gas: ✔, both lower the pH of water when they dissolve in it: ✔
Bboth contain carbon: ✔, both are described as a greenhouse gas: ✔, both lower the pH of water when they dissolve in it: X
Cboth contain carbon: X, both are described as a greenhouse gas: ✔, both lower the pH of water when they dissolve in it: X
Dboth contain carbon: X, both are described as a greenhouse gas: X, both lower the pH of water when they dissolve in it: X
✓ Correct answer
B: both contain carbon: ✔, both are described as a greenhouse gas: ✔, both lower the pH of water when they dissolve in it: X
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