Question

Percentage of lead in pencil is:
a. Zero
b. 20
c. 80
d. 100

Answer 1

The answer to this question is dependent on the fact that lead is the poisonous chemical where the usage of these cannot be made directly in any items. This fact gives you the answer.

Complete step by step answer:
In the lower classes of chemistry, we have studied about the various chemicals which are poisonous to us and which are beneficial to us.
Some basic chemicals we know also include lead and the much known thing we use for writing is the pencil which is basically called lead pencil.
- The composition of the lead pencils are the graphite powder mixed with the binder and this graphite is nothing but the allotrope of carbon.
- They are often called lead pencils because they produce greyish black marks on the surface which looks like lead. But these marks produced are erasable.
- The marks produced are resistant to moisture, most chemicals and also ultraviolet radiations and natural aging.
- These graphite cores are covered with wooden casing and are designed accordingly in many formats which are later being sold.
- Therefore, based on all these above facts we can say that the lead is poisonous chemical and therefore not used in lead pencils even if the name is spelt as ‘lead pencils’.
- This indicates that there is zero percent of lead in lead pencils.
So the correct answer is “A”:

Note: Note that pencils not only have graphite but there are also several other pencils which are made of charcoal and even charcoal is an allotrope of carbon and these are usually used by artists for drawing.