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Metals and Non-metals, NCERT Solutions, Class 10, Science PDF Download

NCERT solutions for Science Textbook Exercise Questions
 
 
Q.1: Which of the following can be beaten into sheets?
(a) Zinc (b) Phosphorous (c) Sulphur (d) Oxygen
Answer: (a)
 
 
Q.2: Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally metals are ductile.
(d) Some non-metals are ductile.
Answer: (c)
 
 
Q.3: Fill in the blanks:
(a) Phosphorous are very __________ non-metal.
(b) Metals are ________ conductor of heat and _____________.
(c) Iron is _________ reactive than copper.
(d) Metals react with acids to produce _______________ gas.
Answer: (a) reactive (b) good, electricity (c) more (d) hydrogen
 
 
Q.4: Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) Generally non-metals react with acids.
(b) Sodium is a very reactive metal.
(c) Copper displaces zinc from zinc sulphate solution.
(d) Carbon can be drawn into wires.
Answer: (a) F (b) T (c) F (d) F
 
 
Q.5: Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of their properties.
Properties
Metals
Non-Metals
1. Appearance
2. Hardness
3. Malleability
4. Ductility
5. Heat conduction
6. Conduction of electricity
 
 
 
Answer:
Properties
Metals
Non-Metals
1. Appearance
2. Hardness
3. Malleability
4. Ductility
5. Heat conduction
6. Conduction of electricity
1. Lustrous.
2. Hard except sodium and potassium.
3. Generally Malleable.
4. Generally ductile.
5. Good conductors.
6. Good conductors.
1. Non-lustrous.
2. Generally soft except diamond.
3. Non-malleable.
4. Non-ductile.
5. Poor conductors.
6. Poor conductors.
 
 
Q.6: Give reasons for the following:
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods are made up of metallic substances.
(c) Copper can not displace zinc from its salt-solution.
(d) Sodium and Potassium are stored in Kerosene.
Answer: (a) Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items.
 
(b) Immersion rods are made of metallic substances metals are good conductors of heat and electricity. They get hot very soon when electric current is passed through them and thus warm the water.
 
(c) Copper can not displace zinc from its salt-solution because copper is less reactive than zinc. A less reactive metal can not displace more reactive metal from its solution.
 
(d) Sodium and Potassium are stored in Kerosene since they are very reactive. They quickly react in air and water.        
 
 
Q.7: Can you store acidic lemon pickles in an aluminium utensil? Explain.
Answer: No, we can not store acidic lemon pickles in aluminium utensils because aluminium is a metal. Metals readily react with acids to produce hydrogen gas. So, if the aluminium metal comes in contact with acidic lemon pickles, it will react to release hydrogen, which would spoil the food and render it unsuitable to consume.
 
 
Q.8: In the following table some substances are given in column I. In column II some uses are given. Match the items in Column I with those in Column II.
Column I
Column II
(i) Gold
(ii) Iron
(iii) Aluminium
(iv) Carbon
(v) Copper
(vi) Mercury
(a) Thermometers
(b) Electric wire
(c) Wrapping food
(d) Jewellary
(e) Machinery
(f) Fuel
 
Answer: (i)-d (ii)-e (iii)-c (iv)-f (v)-b (vi)-a
 
 
Q.9: What happens when:
(i) Dilute sulphuric acid is poured on a copper plate?
(ii) Iron nails are placed in copper sulphate solution?   
Answer: (i) When dilute sulphuric acid is poured on a copper plate it reacts with copper to form copper sulphate and hydrogen. As a result the copper gets eroded which takes place according to the following equation:
Sulphuric acid  +  Copper -->  Copper sulphate  +  Hydrogen.
 
(ii) When iron nails are placed in copper sulphate solution the iron being more reactive will replace copper from its solution to form ferrous sulphate (iron sulphate) and the solution will turn light green.
Iron  +  Copper sulphate  -->  Iron sulphate  +  Copper.  
 
 
Q.10: Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(i) How will she find the nature of the gas?
(ii) Write down equations of all the reactions taking place in this process.
Answer: (i) To check the nature of the gas first she has to dissolve the gas in water. Then she has to test this gaseous solution with litmus paper. If red litmus turns blue, then it is basic in nature and if blue litmus turns red then it is acidic in nature.
 
(ii)
(a) Carbon dioxide  +  Water --> Carbolic acid
(b) Sulphur dioxide  +  Water --> Sulphurous acid.
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FAQs on Metals and Non-metals, NCERT Solutions, Class 10, Science

1. What are metals and non-metals?
Ans. Metals are elements that are characterized by their ability to conduct heat and electricity, their malleability, and their shiny appearance. Non-metals, on the other hand, are elements that generally lack these properties and are poor conductors of heat and electricity. They can be either solids, liquids, or gases at room temperature.
2. What are the physical properties of metals?
Ans. Metals have several physical properties, including high thermal and electrical conductivity, malleability (ability to be hammered into thin sheets), ductility (ability to be drawn into wires), and a shiny appearance. They are also usually solid at room temperature, except for mercury, which is a liquid.
3. What are the physical properties of non-metals?
Ans. Non-metals have physical properties that are generally the opposite of metals. They have low thermal and electrical conductivity, are brittle (easily breakable), and lack a shiny appearance. Non-metals can exist in different states at room temperature, such as solid (carbon, sulfur), liquid (bromine), or gas (oxygen, nitrogen).
4. Give examples of some common metals and non-metals.
Ans. Examples of common metals include iron, copper, aluminum, gold, and silver. Non-metals include elements such as carbon, sulfur, oxygen, nitrogen, and chlorine.
5. What are the uses of metals and non-metals?
Ans. Metals are widely used in various industries and everyday life. Iron is used to make tools, buildings, and vehicles. Copper is used in electrical wiring and plumbing. Aluminum is used in the production of cans and foil. Gold and silver are used in jewelry and currency. Non-metals like carbon are used in the production of fuels, plastics, and graphite for pencils. Oxygen is essential for respiration, and nitrogen is used in the production of fertilizers.
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