MCQ Questions for Class 10 Science: Ch 3 Metals and Non-Metals

1. Metal always found in free state is:
(a) Gold
(b) Silver
(c) Copper
(d) Sodium
► (a) Gold

2. The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
► (b) Aluminium

3. The earthy impurities associated with mineral used in metallurgy are called
(a) Slag
(b) Flux
(c) Gangue
(d) Ore
► (c) Gangue

4. Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity
► (a) Sonorousness

5. A mineral is known as ore if metal
(a) Cannot be produced from it
(b) Can be produced from it
(c) Can be extracted from it profitably
(d) Is very costly
► (c) Can be extracted from it profitably

6. The poorest conductor of heat among metals is
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
► (a) Lead

7. Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
► (d) Sodium > Magnesium > Zinc > Iron

8. Metal always found in free state is:
(a) Gold
(b) Silver
(c) Copper
(d) Sodium
► (a) Gold

9. Al2O3 + 2NaOH → …… + H2O
(a) Al(OH)3
(b) Na2O
(c) NaAlO2
(d) AlNaO2
► (c) NaAlO2

10. Malachite is an are of:
(a) Iron
(b) Copper
(c) Mercury
(d) Zinc
► (b) Copper

11. Non-metals form covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
► (b) they can share electrons with chlorine

12. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Copper sulphate
(c) Haematite
(d) Silica
► (a) Calcined dolomite

13. The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the
(a) electrolysis of their molten chloride
(b) electrolysis of their molten oxides
(c) reduction by aluminium
(d) reduction by carbon
► (a) electrolysis of their molten chloride

14.  The slag obtained during the extraction of copper pyrites is composed mainly of
(a) Cu2S
(b) FeSiO3
(c) CuSiO3
(d) SiO2
Ans. (b) FeSiO3

15. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
(a) FeO
(b) Fe2O3
(c) Fe3O4
(d) Fe2O3 and Fe2O4
► (c) Fe3O4

16. Which of the following non-metal is lustrous?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) Iodine
► (d) Iodine

17. An iron nail was suspended in CuSO4 solution and kept for a while the solution is
(a) Remained blue and coating was found on the nail.
(b) turned green and a coating was formed on the nail
(c) remained blue and no coating was formed on the nail
(d) turned green and no coating was formed on the nail
► (b) turned green and a coating was formed on the nail

18. The common method for extraction of metals from the oxide ore is
(a) Reduction with carbon
(b) reduction with hydrogen
(c) reduction with aluminium
(d) electrolytic method
► (a) Reduction with carbon

19. Which one among the following is an acidic oxide?
(a) Na2O
(b) CO
(c) CO2
(d) Al2O3
► (c) CO2

20. Example of an amphoteric oxide is:
(a) Na2O
(b) K2O
(C) Al2O3
(d) MgO
► (C) Al2O3

21. The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
► (c) Calcination

22. Chemically rust is
(a) Hydrated ferrous oxide
(b) Hydrated ferric oxide
(c) only ferric oxide
(d) none of these
► (b) Hydrated ferric oxide

23. The sulphide ore among the following is
(a) haematite
(b) bauxite
(c) argentite
(d) zinc blende
► (d) zinc blende

24. Setting of Plaster of Paris takes place due to
(a) Solder
(b) Bronze
(c) Brass
(d) Bell metal
► (a) Solder

25. Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using
(a) Aluminium as reducing agent
(b) Sodium as reducing agent
(c) Carbon as reducing agent
(d) Calcium as reducing agent
► (c) Carbon as reducing agent

26. Heating pyrites to remove sulphur is called
(a) Smelting
(b) Calcination
(c) Liquation
(d) Roasting
► (d) Roasting

27. Most abundant metal on the surface of the earth
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
► (b) Aluminium

28. The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
► (c) Ne

29. Some crystals of CuSO4 were dissolved in water. The color of the solution obtained would be
(a) Green
(b) Red
(c) Blue
(d) Brown
► (c) Blue

30. During smelting, an additional substance is added which combines with impurities
to form a fusible product. It is known as
(a) Slag
(b) Mud
(c) Gangue
(d) Flux
► (d) Flux

31. 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.
(a) iron (III) oxide and aluminium powder
(b) iron (II) oxide and aluminium powder
(c) iron (III) chloride and aluminium powder
(d) iron (III) sulphate and aluminium powder
► (a) iron (III) oxide and aluminium powder

32. 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,
(a) X2Y
(b) YZ
(c) XZ3
(d) Y2Z
► (b) YZ

33. Zone refining is used for the
(a) concentration of an ore
(b) Reduction of metal oxide
(c) Purification of metal
(d) Purification of an ore
► (c) Purification of metal

34. 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
(a) Mg
(b) Na
(c) P
(d) Ca
► (b) Na

35.  In the thermite process, the reducing agent is
(a) Nickel
(b) Zinc
(c) Sodium
(d) Aluminium
► (d) Aluminium

36. Galvanisation is a method of protecting iron from rudftng by coating with a thin layer of
(a) Galium
(b) Aluminium
(c) Zinc
(d) Silver
► (c) Zinc

37. The lustre of a metal is due to
(a) its high density
(b) its high polishing
(c) its chemical inertness
(d) Presence of free electrons.
► (d) Presence of free electrons.

38. 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?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
► (c) Z is a non-metal

39.  In addition to iron, stainless steel contains:
(a) nickel and chromium
(b) Copper and tin
(c) aluminium and magnesium
(d) Carbon and magnesium
► (a) nickel and chromium

40. Copper objects lose their shine and form green coating of
(a) Copper oxide
(b) Copper hydroxide and Copper oxide
(c) Basic Copper carbonate
(d) Copper carbonate
► (c) Basic Copper carbonate

41. In the thermite process, the reducing agent is
(a) Nickel
(b) Zinc
(c) Sodium
(d) Aluminium
► (d) Aluminium

42. Which of the statements about the reaction,
ZnO + CO → Zn + CO2 is correct ?
(a) ZnO is being oxidised
(b) CO is being reduced
(c) CO2 is being oxidised
(d) ZnO is being reduced
► (d) ZnO is being reduced

43. A student adds one big iron nail each in four test tubes containing solution of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was added in the solution of:
(a) Zinc sulphate
(b) Iron sulphate
(c) copper sulphate
(d) Aluminium sulphate
► (c) copper sulphate

44. In extraction of copper, the flux used is
(a) CaO
(b) SiO2
(c) FeO
(d) FeSiO3
► (b) SiO2

45. The correct decreasing order of the metals in the activity series is:
(a) Ca, Mg, Ni, Fe
(b) Ni, Ca, Mg, Fe
(c) Ca, Mg, Fe, Ni
(d) Mg, Ca, Fe, Ni
► (c) Ca, Mg, Fe, Ni
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