Question Detail Air is a compoundcolloidelementmixture Answer: Option D Similar Questions : 1. Water drops are spherical because of ? viscositydensitypolaritysurface tension Answer: Option D 2. Atomic number is equal to Number of electronsNumber of nutronNumber of protonsTotal number of protons and neutrons Answer: Option C 3. Acid rain is due to air pollution by ? Carbon dioxideCarbon monoxideMethaneNitrous oxide and Sulphur dioxide Answer: Option D 4. The single acid which dissolves gold is ? Aqua regiaHydrochloric acidNitric acidSelenic acid Answer: Option A 5. Which of the following gases is the most toxic? Carbon dioxideSulphur dioxideCarbon monoxideAcetic acid Answer: Option C Read more from - Chemistry Questions Answers