1. In activity series, elements below Hydrogen cannot displace Hydrogen because
2. When two elements combine together chemically, they form a
3. The most reactive metal in the reactivity series is
4. Metals tend to lose electrons and form
5. Reactivity series of metals, the more reactive metals are at the .....
6. Which of the following chemical equations shows the product of water reacting with potassium oxide
7. The chemical formula of sodium trioxocarbonate (IV) is
8. A reaction that involves the exchange of radicals is called
9. The mass number of Calcium is
10. State symbols are used to ........ in a chemical equation
11. A nuclear fission reaction becoming self-sustaining depends on
12. Helium nuclei particles are called
13. When two atomic nuclei combine it is called as
14. Three types of radioactive elements are emitted when unstable nuclei undergo radioactive decay. Which of the following is not one of them
15. The atomic number is not changed by which type of radioactive decay?
16. Litmus paper is used to test for
17. The relative molecular mass of CO2 is {carbon = 12, Oxygen = 16
18. The symbol of Silver is
19. The conversion of reactants to products is termed
20. The following are radioactive elements except
