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Which one of the following elements is used in pencil-lead |
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(a) |
Zinc |
(b) |
Lead |
|
(c) |
Carbon (Graphite) |
(d) |
Tin |
|
Which one of the following elements is used in pencil-lead |
|||
|
(a) |
Zinc |
(b) |
Lead |
|
(c) |
Carbon (Graphite) |
(d) |
Tin |