Question 20
Question 20 of 40
Question image for Q20
Periodic Table
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
6. Chemical reactions
6.3. Reversible reactions and equil...

State the sources of the hydrogen (methane) and nitrogen (air) in the Haber process

10. Chemistry of the envi...
10.3. Air quality and climate

Describe photosynthesis as the reaction between carbon dioxide and water to produce glucose and oxygen in the presence of chlorophyll and using energy from light

4. Electrochemistry
4.2. Hydrogen–oxygen fuel cells

State that a hydrogen–oxygen fuel cell uses hydrogen and oxygen to produce electricity with water as the only chemical product