The common refrigerant in domestic refrigerator is
1). Neon
2). Oxygen
3). Nitrogen
4). Freon
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1. How many neutrons does iron have?
2. Atomic number of an atom gives the number of which of the following ?
4. Which one of the following is radioactive ?
5. Which type of fire extinguisher is used for petroleum fire ?
6. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water
9. Which one of the following minerals is found in pure form?