Question Detail Atomic number is equal to Number of electronsNumber of nutronNumber of protonsTotal number of protons and neutrons Answer: Option C Similar Questions : 1. Which of the following is produced during the formation of photochemical smog ? Nitrogen OxidesHydrocarbonsMethaneOzone Answer: Option D 2. Permanent hardness of water is due to the presence of ? Magnesium bicarbonateCalcium bicarbonateSodium bicarbonateCalcium sulphate Answer: Option D 3. What is the chemical name of table salt ? Sodium nitrateAmmonium chlorideSodium chlorideCalcium chloride Answer: Option C 4. Water drops are spherical because of ? viscositydensitypolaritysurface tension Answer: Option D 5. Which gas is used in fire extinguishers ? Carbon dioxideNitrogen oxideCarbon monoxideSulpher dioxide Answer: Option A Read more from - Chemistry Questions Answers