MCQ Questions for Class 10 Science Chapter 3 Metals and Non-metals with Answers
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1. An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
2. Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
3. The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which’of the following is correct?
4. Amalgam is an alloy of
5. Copper objects lose their shine and form green coating of
6. The ability of metals to be drawn into thin wires is known as
7. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point
8. Due to its semiconductor properties the non-metal used in computer, T.V. etc. is
9. What happens when calcium is treated with water? (i) It does not react with water. (ii) It reacts violently with water. (iii) It reacts less violently with water. (iv) Bubbles of hydrogen gas formed stick to the surface of calcium.
10. Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
11. Which of the following metals are obtained by electrolysis of their chlorides in molten state? (i) Na (ii) Ca (iii) Fe (iv) Cu
12. An alloy reacted with dilute hydrochloric acid to produce a gas which ‘pops’ a lighted splint. The residue reacted with dilute nitric acid to form a blue solution. Which one of the following pairs of metals is present in the alloy?
13. Aluminium is used for making cooking uten¬sils. Which of the following properties of alu¬minium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point
14. The most abundant metal in the earth’s crust is
15. The poorest conductor of heat among metals is
Qu 16. Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
17. Al2O3 + 2NaOH → …… + H2O
18. Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity? Zinc, Iron, Magnesium, Sodium
19. Which of the following pairs will give dis-placement reactions?
20. Non-metals form covalent chlorides because
21. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
22. Which of tire following are not ionic compounds? (i) KCl (ii) HCl (iii) CCl4 (iv) NaCl
23. The electronic configuration of three elements X, Y and Z are as follows: X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,
ANSWER= B. YZ
24. The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the
25. Which of the following non-metal is lustrous?
26. Example of an amphoteric oxide is:
27. Which one among the following is an acidic oxide?
28. The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
29. Galvanisation is a method of protecting iron from rudftng by coating with a thin layer of
30. The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
31. Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using
32. In thermite welding a mixture of …… and …… is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved.
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