Percentage of lead in lead pencil is________?
Correct answer: A. Zero
- A. Zero
- B. 20
- C. 80
- D. 70
Explanation
A lead pencil contains graphite, a form of carbon, mixed with clay and sometimes wax, so it contains no metallic lead. Therefore the percentage of lead is 0%. The likely wrong choice is 20% or 70%, caused by interpreting the name lead pencil literally rather than recognising that graphite makes the mark.
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About Reactions of Group IV Elements
Group IV, or Group 14, chemistry covers the trends from carbon and silicon to tin and lead, including their reactions with oxygen, halogens, water, acids and alkalis. It also examines the structures and properties of their oxides and chlorides, oxidation states, and the inert pair effect, rather than treating all members as equally metallic.
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