6. The following metals are listed in order of the increasing reactivity toward water. (a) Li

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6 The Following Metals Are Listed In Order Of The Increasing Reactivity Toward Water A Li Na K Rb Cs C Cs Rb 1 (73.06 KiB) Viewed 98 times

6. The following metals are listed in order of the increasing reactivity toward water. (a) Li<Na <K<Rb <Cs (c) Cs < Rb <K<Na<Li (b) Ba<Sr< Ca< Mg <Be (d) Li< Na < Be < Mg < Ca 7. Which of the following process or method is used in the preparation of metals (a) Zone Refining (b) Roasting (c) Flotation (d) Chemical reduction 8. The half-life of U-235 is 24,000 years. If you started with 10 g of U-235, how much would remain after 4 half-lives? (a) 5.0 g (b) 2.5 g (c) 1.25 g (d) 0.625 g 9. Which naturally occurring radioactive particles is the size of a helium nucleus? (a) X-ray (b) Alpha (c) Beta (d) Gama 10. Which of the following nuclear processes results in a decrease in the number of neutrons by 1 and an increase in the number of protons by 1 in the product element? (a) Electron capture (b) Alpha emission (c) Beta emvision (d) Positron emmistion