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
- Noble metals are usually unreactive.
- Breaking up of the non-metals into pieces is known as brittleness.
- On burning, metals form oxides.
- The main constituent of German silver is nickel.
- Steel alloy is used in the manufacture of rails.
Match the following :-
- Duralumin – Parts of aeroplane
- Stainless Steel – Medical Instrument used in surgery
- Phosphorous – Match box
- Chlorine – Disinfectant
- Gold – Ornaments
Mark the statements true or false :-
- All metals are solid at room temperature.[T]
- Sodium is more reactive than magnesium.[F]
- Stainless steel is an alloy of iron, nickel, carbon and chromium.[F]
- Non metals react with oxygen to form alkaline oxides (basic oxide).[F]
- 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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