An atom of an element has atomic number 17 and mass number36 The number of neutrons in its nucleus is
1). 17
2). 19
3). 36
4). 53
2. Atomic number of an atom gives the number of which of the following ?
3. Question 7.2:Why does the reactivity of nitrogen differ from phosphorus?
4. Which of the following is responsible for permanent hardness of water?
5. Electric bulbs are filled with :
6. Which of the following is a metallic ore ?
8. Glycol is added to aviation gasoline because it
9. Neoprene is prepared by polymerisation of which of the following
10. Among the fuels given below the one with highest calorific value is