Question Detail Air contains maximum amount of oxygennitrogenhydrogencarbon dioxide Answer: Option B Ad Similar Questions : 1. The luster of a metal is due to : high polishinghigh densitychemical inertnesspresence of free electrons Answer: Option D 2. The single acid which dissolves gold is ? Aqua regiaHydrochloric acidNitric acidSelenic acid Answer: Option A 3. Mass number of a nucleus is : the sum of the number of protons and neutrons present in the nucleusalways more than the atomic weightalways less than its atomic numberNone of above Answer: Option A 4. Rare gases are mono atomicdi atomictri atomicNone of above Answer: Option AExplanation:Rare gases are mono atomic. 5. Bleaching action of chlorine is by decompositionhydrolysisreductionoxidation Answer: Option A Read more from - Chemistry Questions Answers