Question Detail Which gas is filled in refrigerators ? ChlorofluorocarbonAcetyleneMethaneButane Answer: Option A Ad Similar Questions : 1. 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 2. Alloys made with mercury as one metal are called ? mixturesemulsionssoldersamalgams Answer: Option D 3. Natural rubber is a polymer derived from ? ethylenepropyleneisoprenebutadiene Answer: Option C 4. What nucleus of atom contains ? protonselectronselectrons and protonsprotons and neutrons Answer: Option D 5. The ejection of electrons when a metal surface is irradiated is known as Black body radiationPhotoelectric effectZeeman effectAtomic spectrum Answer: Option B Read more from - Chemistry Questions Answers