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Chhattisgarh Board Class 8 Science Chapter 5 Solution

Last updated on February 6th, 2024 at 12:47 am

Chhattisgarh Board Class 8 Science Chapter 5  Solution Textbook question and answers as well as extra question and answers from the chapter

 

Choose the correct alternative :-

This is not a property of metals

a) Fragility  b) Conduction of electricity

c) High density d) Malleability and ductility

Correct Answer: a) Fragility

 

Out of the three pins of gold, silver and iron which pin can get a coat of copper when dipped in copper sulphate solution :-

a) Iron b) Gold        c) Silver       d) None of these

Correct Answer: c) Silver

 

Which halogen is used as an antiseptic?

a) Fulorine b) Chlorine c) Bromine    d) Iodine

Correct Answer: d) Iodine

 

Iron rusts :-

a) Only in air b) Only in presence of carbon dioxide

c) Only in water d) In presence of both air and water

Correct Answer: d) In presence of both air and water

 

An example of Noble metal is :-

a) Iron b) Copper     c) Gold        d) Aluminium

Correct Answer: c) Gold

 

Which of these is classified as metal or non-metal :-

a) Element   b) Compound        c) Mixture   d) All of these

Correct Answer: a) Element

 

Fill in the blanks

  1. Noble metals are usually unreactive.
  2. Breaking up of the non-metals into pieces is known as brittleness.
  3. On burning, metals form oxides.
  4. The main constituent of German silver is nickel.
  5. Steel alloy is used in the manufacture of rails.

 

Match the following :-

  1. Duralumin – Parts of aeroplane
  2. Stainless Steel – Medical Instrument used in surgery
  3. Phosphorous – Match box
  4. Chlorine – Disinfectant
  5. Gold – Ornaments

 

Mark the statements true or false :-

  1. All metals are solid at room temperature.[T]
  2. Sodium is more reactive than magnesium.[F]
  3. Stainless steel is an alloy of iron, nickel, carbon and chromium.[F]
  4. Non metals react with oxygen to form alkaline oxides (basic oxide).[F]
  5. Rusting is an example of corrosion of metals.[T]

 

Answer the following questions :-

Differenciate metals and non metals on the basis of physical and chemical properties. Write three differences of each.

Metals

Metals are typically shiny and have metallic luster.

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