The combustible material at the tip of a safety match sitck is
1 Sulphur
2 Manganese dioxide
3 Phosphorus
4 Antimony sulphide
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(4) Antimony sulphide
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Please can someone tell me, how many times during a 12 hour period, do the hands of a clock face opposite each other? I believe its 11. Also, would this be the same, no matter WHAT the starting time? i.e. if the 12 hour period started at 6 o clock, would it still be 11 times? Many thanks for your help.
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