Which of the following chemicals is used as pain killer ?

Which of the following chemicals is used in foam fire extinguisher ?

Which of the following chemical compounds is used as a preservative in pickle?

Which of the following chemical tests is used in the diagnosis of typhoid?

Which of the following chemicals are used as moth repellents ?

Which of the following chemicals can be used as anticoagulant ?

Which one of the following chemicals is responsible for the production of HCl in the stomach leading to irritation and pain ?

Which of the following chemicals are used by insects to attract mate?