CBSE Class 10 Science Chapter-3 Metals and Non-metals Important Questions – Free PDF Download
Free PDF download of Important Questions with Answers for CBSE Class 10 Science Chapter 3 – Metals and Non-metals prepared by expert Science teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board examination.
CBSE Class 10 Science Metals and Non-metals Chapter-3 Important Questions
CBSE Class 10 science Important Questions Chapter 3 – Metals and Non-metals
1 Mark Questions
1. 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
Ans. (c) Can be extracted from it profitably
2. The earthy impurities associated with mineral used in metallurgy are called
(a) Slag
(b) Flux
(c) Gangue
(d) Ore
Ans. (c) Gangue
3. A basic lining is given to a furnace by using
(a) Calcined dolomite
(b) Copper sulphate
(c) Haematite
(d) Silica
Ans. (a) Calcined dolomite
4. Malachite is an are of:
(a) Iron
(b) Copper
(c) Mercury
(d) Zinc
Ans. (b) Copper
5. Metal always found in free state is:
(a) Gold
(b) Silver
(c) Copper
(d) Sodium
Ans. (a) Gold
6. A process employed for the concentration of sulphide ore is
(a) Froth floatation
(b) Roasting
(c) electrolysis
(d) bessemerisation
Ans. (a) Froth floatation
7. The slag obtained during the extraction of copper pyrites is composed mainly of
(a) 
(b) 
(c) 
(d) 
Ans. (b)
8.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
Ans. (a) Reduction with carbon
9. An iron nail was suspended in 
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
Ans. (b) turned green and a coating was formed on the nail
10. The sulphide ore among the following is
(a) haematite
(b) bauxite
(c) argentite
(d) zinc blende
Ans. (d) zinc blende
11. Chemically rust is
(a) Hydrated ferrous oxide
(b) Hydrated ferric oxide
(c) only ferric oxide
(d) none of these
Ans. (b) Hydrated ferric oxide
12. Heating pyrites to remove sulphur is called
(a) Smelting
(b) Calcination
(c) Liquation
(d) Roasting
Ans.(d) Roasting
13. Setting of Plaster of Paris takes place due to
(a) Solder
(b) Bronze
(c) Brass
(d) Bell metal
Ans. (a) Solder
14. Some crystals of 
were dissolved in water. The color of the solution obtained would be
(a) Green
(b) Red
(c) Blue
(d) Brown
Ans. (c) Blue
15. Most abundant metal on the surface of the earth
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Ans. (b) Aluminium
16. 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
Ans. (c) Purification of metal
17. Which of the following processes is used for the concentration of Bauxite 
(a) Froth floatation
(b) Leaching
(c) Liquation
(d) Magnetic separation
Ans. (b) Leaching
18. 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
Ans. (d) Flux
19. 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.
Ans. (d) Presence of free electrons.
20. In the thermite process, the reducing agent is
(a) Nickel
(b) Zinc
(c) Sodium
(d) Aluminium
Ans. (d) Aluminium
21. In addition to iron, stainless steel contains:
(a) nickel and chromium
(b) Copper and tin
(c) aluminium and magnesium
(d) Carbon and magnesium
Ans. (a) nickel and chromium
22. 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
Ans. (c) Ca, Mg, Fe, Ni
23. Which of the following oxides is amphoteric in nature?
(a) 
(b) Mgo
(c) CaO
(d) 
Ans. (d) 
24. 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
Ans. (c) copper sulphate
25. Iron nail clipped in a solution kept in a test tube. After half an hour it was observed that the colour of the solution was changed. The solution in test tube was that of:
(a) Zinc sulphate
(b) Copper sulphate
(c) Iron sulphate
(d) Aluminium sulphate
Ans. (b) Copper sulphate
26. Name two metals which are found in nature in the free state.
Ans. Gold and Platinum
27. What chemical process is used for obtaining a metal from its oxide?
Ans. A metal is obtained from its oxide by the process of reduction.
28. Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) 
solution and aluminum
(c) 
solution and silver metal
(d) 
solution and copper
Ans. (d) 
solution and copper
29. Which of the following method is suitable for preventing an iron fry pan from rusting?
(a) Applying grease
(b) applying paint
(c) Applying coating of zinc
(d) All of the above
Ans. (c) Applying coating of zinc
30. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) Calcium
(b) Carbon
(c) Silicon
(d) Iron
Ans. (a) Calcium
31. Food cans are coated with tin and not zinc because
(a) Zinc is costlier than tin
(b) Zinc has higher melting point
(c) Zinc is more reactive than tin
(d) Zinc is less reactive than tin
Ans. (c) Zinc is more reactive than tin
32. What types of oxides are formed when non-metals combine with oxygen?
Ans. Acidic oxides are formed when non-metals combine with oxygen.
33. Royal water is prepared by mixing two acids ‘A’ and ‘B’. It can dissolve gold and platinum. It is highly corrosive and fuming liquid. Identify ‘A’ and ‘B’. What is the ratio in which ‘A’ and ‘B’ are mixed.
Ans. 
