O-LevelChemistryChemistry of the Environment5070/11 · May/June 2017 · Q321 Mark
Which row correctly compares carbon dioxide and methane? both contain carbon both are described as a greenhouse gas both lower the pH of water when they dissolve in it A ✓ ✓ ✓ B ✓ ✓ X C ✓ X ✓ D ✓ X X
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 (✓), both are described as a greenhouse gas (X), both lower the pH of water when they dissolve in it (✓)
Dboth contain carbon (✓), 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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