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Which one of the following substances is used in manufacture of safety matches? |
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(a) |
Red phosphorus |
(b) |
White phosphorus |
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(c) |
Phosphorus trioxide (P203) |
(d) |
Black phosphorus |
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Which one of the following substances is used in manufacture of safety matches? |
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|||
|
(a) |
Red phosphorus |
(b) |
White phosphorus |
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|
(c) |
Phosphorus trioxide (P203) |
(d) |
Black phosphorus |
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