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Question 16 : Which of the following does not function as lewis acid? Bi N Ar Sb Question 17 : Which of the following is prepared by haber process? phosphorus bismouthine Ammonia nitric acid Question 18 : Which of the following is the most abundant uncombined element accessible to man? N He O H Question 19 : One of these is not a raw material for the cement manufacture? lime alumina silica silicate Question 20 : Which of the following is used as a rocket fuel? Ammonia ,hydrazine hydrazoic acid phosphine
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