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(P) When a chemical substance 
(Q) the food poisoning occurred 
(R) in the food preparations 
(S) was mistaken for salt and used

  • A.PSRQ
  • B.RQPS
  • C.QPSR
  • D.SRQP

Answer: C

Correct answer: QPSR

The sentence reads:

The food poisoning occurred when a chemical substance was mistaken for salt and used in the food preparations.

Q is the only part with a main verb, so it must open the sentence; P begins the subordinate clause with when, and S supplies that clause's verbs. R can only attach to used, so it goes last.

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