Question 24
Question 24 of 40
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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
3. Stoichiometry
3.2. Relative masses of atoms and m...

Describe relative atomic mass, \( A_r \), as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of \( ^{12}C \)

3. Stoichiometry
3.3. The mole and the Avogadro cons...

Calculate percentage yield, percentage composition by mass and percentage purity, given appropriate data

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

Explain how oxides of nitrogen form in car engines and describe their removal by catalytic converters, e.g. 2CO + 2NO → 2CO2 + N2