NCERT class 8 Materials : Metals and Non - Metals

Define : Malleability

• The property of metals by which it can be drawn into wires.

• The property of metals by which they can be beaten into thin sheets

• Produce ringing sounds

• All of the above

Properties of metal

• Hard and Lustrous

• Malleable and Ductile

• Sonorus and good conductors of heat

• All of the above

• None of the above

When sulphur dioxide is dissolved in water sulphric acid is formed

• True

• False

Generally, Non Metals react with acids.

• True

• False

One metal displaces another metal from its compound in aqueous solution

• True

• False

Which of the following statements are true :-

• Copper does not react with dilute hydrochloric acid even on heating

• Metals react with sodium hydroxide to produce hydrogen gas

• Copper does not react with sulphric acid

Non-metals are not sonorus

• True

• False

Oxide of magnesium is basic in nature

• True

• False

On burning, metals react with oxygen to produce metal oxides which are basic in nature

• True

• False

Non - metals react with oxygen to produce non-metallic oxides which are

• basic in nature

• acidic in nature