B. VERY SHORT-ANSWER QUESTIONS: Give one-word answers.
1. Name a metal which is liquid at room temperature.____
2. Metals generally have a low specific gravity. True or false?___
3. If a material can be drawn into thin wires, it is said to be_____
4. Aluminium does not react with water. True or false?___
5. Zn + Cuso, → ZnSO, + Cu is an example of a_____reaction
6. Which metal is higher up in the reactivity series-sodium or silver?________
7. Any rock containing metallic mineral is called an ore. True or false?___
8._____is the most abundant element in the universe, whereas______is the most
abundant element in the earth's crust.
9. Sand contains the elements_____and_____
10. Which non-metal has very high melting and boiling points?______
11. Metal food containers have a coating of_____
12. Name a soft metal.___
13. What is the black material inside a pencil?______
14. Metals react with oxygen to produce_____oxides, and non-metals react with oxygen to
produce______oxides.
15. Do non-metals react with water?_____
16. A metal X can replace another metal Y from its metal salt. Is X above or below Y in the reactivity series?____
17. The presence of air and_____are necessary for iron to rust.
18. Galvanized iron starts rusting if there is a scratch on the zinc layer. True or false?___
19. Copper corrodes in the presence of_____and water.
20. Name a metal that does not corrode in air._____
Answers
Answer:
1. mercury
2. false
3. ductility
4. false
5. metal displacement
6. sodium
7. True
8. oxygen
9. silica and quartz
10. Diamond and Graphite
11. zinc
12. alkali
13.lead
14. basic, acidic
15. yes
17.moisture
18. false
19. aqueous solution
20. aluminum
16 number I don't know
Answer:
1: MERCURY
2: FALSE
3: DUCTILITY
4: FALSE
5: METAL DISPLACEMENT
6: SODIUM
7: FALSE
8: HYDROGEN , OXYGEN
9: SALICA & QUARTZ
10: GRAPHITE
11: ZINC
12: ALKALI
13: LEAD
14: ACID AND BACE
15: YES
16: When metal X replaces metal Y from its respective salts, X is above in the reactivity series. The reactivity power of X is stronger than Y which ensures this replacement. If it would be below than Y, no reaction would take place as it would not displace Y.
17: MOISTURE
18: FALSE
19: AQUEOUS SOLUTIONS
20: ALUMINIUM
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