1.

1 : Charles Goodyear once accidentallyP : and found that the resulting rubberQ : dropped a mixture of natural rubberR : was harder, stronger, more elasticS : and sulphur over a hot stove6 : and non-stickyThe Proper sequence should be:

A. SQR
B. SPR
C. SQP
D. QPR
Answer» C. SQP


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