31.)Tetraethyl lead is used as ___ (A)Mosquito repellent (B)Pain Killer (C)Fire extinguisher (D)Petrol additive View Answer Correct Answer: D. 32.)Which of the following is used in beauty parlours for hair setting? (A)Phosphorus (B)Sulphur (C)Chlorine (D)Silicon View Answer Correct Answer: B. 33.)Which of the following is a non-metal that remains liquid in room temperature? (A)Bromine (B)Chlorine (C)Helium (D)Phosphorus View Answer Correct Answer: A. 34.)Which of the following is the lightest metal? A.MercuryB.Lithium C.LeadD.Silver View Answer Correct Answer: B.