InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the property of metal caused for shining appearance? |
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Answer» Answer is Metallic lustre. |
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| 2. |
Match the columns:Column ‘A’Column ‘B’1. Coppera. Low melting point2. Sodiumb. Liquid3. Magnesiumc. High melting point4. Borond. Conduction of heate. 2, 8 2 |
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| 3. |
Match the columns:Column ‘A’Column ‘B’1. Silvera. Copper + tin2. Mercuryb. Medicines3. Platinumc. Thermometer4. Brassd. Catalyst |
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| 4. |
Identify the odd term :(i) Gold, Silver, Iron, Diamond.(ii) Ductility, Brittleness, Sonority, Malleability.(iii) Carbon, Bromine, Sulphur, Phosphorus.(iv) Brass, Bronze, Iron, Steel. |
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Answer» (i) Diamond. (Others are metals.) (ii) Brittleness. (Other properties are metallic properties.) (iii) Bromine. (Others are solids.) (iv) Iron. (Others are alloys.) |
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| 5. |
Iron made objects will undergo quick rusting. Give reason? What are the methods used to prevent the speed of the process? |
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Answer» Iron became destroyed when it can react with atmospheric oxygen and moisture form hydrated iron oxide (rust)
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| 6. |
Give scientific reason:The stainless steel vessels in kitchen have copper coating on the bottom. |
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Answer» 1. Stainless steel is an alloy of iron ; with carbon, chromium and nickel. 2. The conductivity of copper is higher than that of iron in steel. Copper heats uniformly and faster. The time for cooking is reduced, as a result it saves fuel. Hence, the stainless steel vessels in kitchen have copper coating on the bottom. |
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| 7. |
Why should we paint the iron bars of window? |
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Answer» To protect them from rusting |
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| 8. |
Write the following rentals in the ascending order of the reactivity with acids. Copper, sodium, iron, aluminium |
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Answer» Sodium, iron, aluminium, copper |
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| 9. |
Why are aluminium rods not used to reinforce concrete? |
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Answer» Pure aluminium is thin, not sufficiently hard and strong. So aluminium rods are not used to reinforce concrete. |
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| 10. |
Fill the tableUsePropertyTo make utensils…………………To make aluminium foil…………………To making farming tools…………………To make electric wire…………………To make bells………………… |
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| 11. |
Butter milk is not kept in aluminium vessels. Why? |
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Answer» Butter milk is acid. So it reacts with aluminium |
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| 12. |
Which metal is seen in liquid state? |
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Answer» Answer is Mercury |
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| 13. |
Which are the metals found in free state! Why? |
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Answer» Metals like gold, platinum, silver, copper etc. are found in free state, . because these metals do not react with air. |
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| 14. |
Find the odd one out. Write the reason.a. Iron, aluminium, sodium, copperb. Silver, gold, sulphur, lead |
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Answer» a. Sodium. Sodium is a soft metal while others are hard metals b. Sulphur. Sulphur is a non-metal others are metals. |
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| 15. |
Collect the following materials: an iron nail, an aluminium wire, a pencil lead, a copper Beat them hard using a hammer. Which of then be Can he flattened? What is your conclusion from this experiment? |
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Answer» Iron nail, aluminium wire. The metals have malleability. |
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| 16. |
The names of some metals are given below. Tungsten, Gold, Sodium, Copper, Iron, MagnesiumAnswer the following questions by selecting the appropriate ones from the list.Which metal with high malleability is used for making ornaments?Which of these metals reacts with cold water?Which of these is a hard metal but corrodes easily? |
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| 17. |
Among the statements given below which are true about metals.a. Metals bumb. Metals can be beaten into thin sheets. c. Metals are dull in appearance. d. Metals are good conductor of heat. e. Metals conduct electricity. f. Metals break into small pieces when struck with a hammer. |
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Answer» Answer is b, d, and e |
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| 18. |
Write the following metals in the ascending order of electrical conductivity. Silver, copper, aluminium |
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Answer» Aluminium, copper, silver |
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| 19. |
Does any immediate change occur when a bright nail is exposed to air? What happens to it after a few days? |
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Answer» Immediate change does not occur. After a few days it reacts slowly with air and gets a coating of oxide. |
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| 20. |
Give two example of metalloids. |
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Answer» Metalloids: Arsenic (As), germanium (Ge), antimony (Sb). |
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| 21. |
State the atomic number and electronic configuration of aluminium. |
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Answer» Atomic number of aluminium: 13. Electronic configuration of aluminium (Al): 2, 8, 3. |
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| 22. |
State the atomic number and electronic configuration of nitrogen. |
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Answer» Atomic number of nitrogen: 7. Electronic configuration of nitrogen (N): 2, 5. |
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| 23. |
The electronic configuration of oxygen is …………….. . (a) 2, 5 (b) 2, 6 (c) 2, 4 (d) 2, 8, 6 |
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Answer» Correct option is (b) 2, 6 |
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| 24. |
What are the two things which are caused to form verdigris on copper? |
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Answer» Air and water vapour |
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| 25. |
Select the metals which do not react with air. Copper, iron, gold, magnesium, platinum, sodium, silver |
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Answer» Gold, silver, platinum |
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| 26. |
Why sodium and potassium are kept in kerosene? |
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Answer» Because they vigorously react with air. |
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| 27. |
The window bars near sea shore undergo rusting quickly. Why? |
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Answer» Iron react with saltwater quickly and undergo corrosion. |
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| 28. |
Aluminium vessels get tarnished after few days they purchased. Why? |
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Answer» aluminium undergo chemical reaction with air and a covering is formed. |
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| 29. |
What are the components effecting rusting of iron? |
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Answer» Air, moisture present in atmosphere |
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| 30. |
Even though the electric conductivity is less the wires on electric posts are made up of aluminium. Why? |
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Answer» Due to less weight and cost. |
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| 31. |
Name an alloy of copper and tin. |
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Answer» An alloy of copper and tin is termed as bronze. |
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| 32. |
Is there any advantage, if iron nails are kept inside kerosene. Why? |
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Answer» Yes, it prevent rusting. Iron nails, when kept inside kerosene, are protected from rusting. They are not in contact with atmospheric air or moisture. |
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| 33. |
Connect a torch bulb to the battery with the different metal wires. Find out which wire gives the highest brightness to the bulb? Arrange the wires in the decreasing order of their electrical conductivity. |
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Answer» Iron-copper-aluminium-nichrome |
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| 34. |
Give reasons for the following statements.Tamarind is not stored in aluminium vessels.It is a common practice to apply oil on iron articles and tools.Stainless steel knives, instead of iron knives, are preferred for cutting citrus fruits. |
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Answer» a. Tamarind is acidic. So aluminium corrodes by reacting with acid b. To reduce the contact with air c. Gtrus fruit is acidic. It reacts with iron. |
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| 35. |
Which among the metals is stored in kerosene?(a) Sodium (b) Iron (c) Tungsten (d) ChromiumWhy is it stored in kerosene? |
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Answer» a. Sodium. Becuase they vigorously react with air. |
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| 36. |
Consider the relation between the items in the first pair and write the correlation for second pair:(i) Mercury : Metal : : Carbon : …………. .(ii) Wood : Bad conductor of electricity : : Copper : ……………(iii) Gold : Noble metal : : Copper: ……………. .(iv) Iron and carbon : Steel : : Copper and Tin : ……….. .(v) 0 : 2, 6 : : Mg : …………….. . |
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Answer» (i) Non-metal (ii) Good conductor or electricity (iii) Metal (iv) Bronze (v) 2, 8, 2. |
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| 37. |
Rewrite the sentences after filling the blanks:(i) Iodine and ……………. are the two non – metals having typical metallic lustre.(ii) Non-metals form ………. ions by gain of electrons.(iii) During formation of positively charged ion, atom of metal ………….. . |
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Answer» (i) Iodine and diamond are the two nonmetals having typical metallic lustre. (ii) Non-metals form negative ions by gain of electrons. (iii) During formation of positively charged ion, atom of metal lose electrons. |
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| 38. |
You have understood the properties of metals. Find out the metals mentioned in the following cases.a. Which metal is used in the storage batteries of vehicles?b. Most of the metals are solids. Which metal exists as a liquid even at low temperatures?c. Iron articles are coated with other metals to protect them from corrosion. Which are the two metals usually used for this purpose?d. Metals have high density. Which is the densest metal? |
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Answer» a. zinc b. mercury c. zinc, magnesium d. gold |
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| 39. |
Tabulate the general properties of metals |
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Answer» Hardness, High density, Ductility, Malleability, Sonority, Thermal conductivity, Electrical conductivity. |
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| 40. |
List some of the general properties of metals. |
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Answer» Generally metals, are good conductors of electricity, are good conductors of heat, are malleable (can be hammered into thin sheets), are ductile (can be pulled into wires), are solids (except mercury), are hard and strong, have metallic lustre, have high densities, have high melting points, have high boiling points |
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| 41. |
What are the situation make use of the following properties of metals Hardness, malleability, thermal conductivity, electrical conductivity, ductility |
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Answer» To make farming tools • To make aluminium foil, • To make utensils • To make electrical equipments • To make ornaments |
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| 42. |
Based on the physical properties of metals, indicate whether the following statements are true or false1. Aluminium is a conductor of electricity.2. The metal caesium melts at high temperatures.3. Platinum is a metal with poor malleability. 4. Potassium is a hard metal. 5. Copper, metal is sonorous. 6. The density of gold is very low. 7. Copper is a good conductor of heat. 8. Sodium is a hard metal. 9. One of the reasons for the use of gold in making ornaments is its metallic lustre. 10. The ductility of tungsten is high. |
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Answer» 1. true 2. false 3. true 4. false 5. true 6. false 7. true 8. false 9. true 10. true |
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| 43. |
Iron is a metal which corrodes fast.a. What are the factors that favour the corrosion of iron?b. In coastal regions, copper nails are preferred to iron nails. What could be the reason?c. Can you suggest some measures to prevent the corrosion of iron? |
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Answer» a. Air and water vapour in the atmosphere b. Iron rod corrodes quickly in salt water c. Painting on the metal, electroplating with non corrosive metals |
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| 44. |
Some metals are listed below. Complete the table by identifying the different uses and the properties which are responsible for the same.MetalUsePropertyGoldCopperAluminiumZincIron |
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| 45. |
The valence electron in …………… atom is 1. (a) magnesium (b) sodium (c) silicon(d) aluminium |
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Answer» Correct option is (b) sodium |
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| 46. |
…………….. is an acidic oxide. (a) Na2O (b) CO2(c) FeOs (d) H2O |
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Answer» Correct option is (b) CO2 |
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| 47. |
…………… is a highly malleable metal. (a) Iron (b) Nickel (c) Manganese (d) Aluminium |
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Answer» Correct option is (d) Aluminium |
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| 48. |
Name two metals which are ductile. |
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Answer» Gold and silver are ductile metals. |
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| 49. |
Name two metals which are malleable. |
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Answer» Iron and aluminium are malleable metals |
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| 50. |
Pure ………… is soft. (a) aluminium (b) silver (c) gold (d) platinum |
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Answer» Correct option is (c) gold |
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