Which one of the following elements is used in the manufacture of safety matches? |
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(a) |
Graphite |
(b) |
Phosphorus |
|
(c) |
Silicon |
(d) |
Sodium |
Which one of the following elements is used in the manufacture of safety matches? |
|
|||
(a) |
Graphite |
(b) |
Phosphorus |
|
(c) |
Silicon |
(d) |
Sodium |