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ScienceClass 8ICSE

State whether the following statements are true or false? (a) All metals exist in solid form at room temperature. (b) Coal can be drawn into wires. (c) Non-metals react with dilute acids to produce hydrogen gas. (d) Sodium is a very reactive metal. (e) Copper displaces zinc from a zinc sulfate solution. (f) Rust formed on iron objects is basic in nature. (g) Non-metals react with water to form a gas which burns with a ‘pop’ sound.

Answer True False False True False True False

ScienceClass 8ICSE

Name the non-metal used to make purple colored solution which is applied on cuts and wounds as an antiseptic.

Answer the non-metal used to make purple colored solution which is applied on cuts and wounds as an antiseptic is Iodine.

ScienceClass 8ICSE

Which non-metal is used in the water purification process to make drinking water supply germ-free?

Answer Chlorine is the non-metal used in the water purification process to make drinking water supply germ- free.

ScienceClass 8ICSE

Name one non-metal used for making fertilizers.

Answer Phosphorus is the non-metal used for making fertilizers.

ScienceClass 8ICSE

Name the non-metal which is essential for maintaining life and inhaled during breathing.

Oxygen is the non-metal which is essential for maintaining life and inhaled during breathing.

ScienceClass 8ICSE

Which metal is used to galvanize iron to protect it from rusting?

Answer Zinc metal is used to galvanize iron to protect it from rusting.

ScienceClass 8ICSE

Where is iron present in our body?

Answer The red pigment hemoglobin in blood contains iron in our body.

ScienceClass 8ICSE

Name two metals which are used to make jewelry.

Answer Gold and silver are used to make jewelry.

ScienceClass 8ICSE

Name the metal which is used to make thin foils for packaging medicines, chocolates, and food items, etc.

Answer The metal which is used to make thin foils for packaging medicines, chocolates, and food items, etc. is aluminum.

ScienceClass 8ICSE

Name two metals which are used for making electric wires.

Answer Copper and aluminum are used for making electric wires.

ScienceClass 8ICSE

Name two metals which are used for making cooking utensils and water boilers for factories.

Answer Copper and Iron are the two metals which are used for making cooking utensils and water boilers for factories.

ScienceClass 8ICSE

Name the metal which is used in making thermometers.

Answer Mercury (Hg) is the metal that is used in making thermometers.

ScienceClass 8ICSE

Write a word equation for the reaction of magnesium with oxygen.

Answer Metals react with oxygen in the air to produce metal oxides. For example, magnesium reacts with oxygen to produce magnesium oxide when it is heated in air: Magnesium + oxygen → Magnesium oxide Mg + O2→2MgO

ScienceClass 8ICSE

Which metal is more reactive: iron or zinc?

Answer Zinc is more reactive than Iron.

ScienceClass 8ICSE

Which metal is less reactive: copper or iron?

Answer Copper is less reactive than Iron.

ScienceClass 8ICSE

Name any five objects used in our everyday life which are made of metals.

Answer Utensils, Pencils, Bottles, Nail cutter, and Wires are the objects used in our everyday life which are made of metals.

ScienceClass 8ICSE

(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas. (b)Name one metal which does not react with dilute hydrochloric acid.

Answer Sodium Copper

ScienceClass 8ICSE

Name the gas evolved when a metal reacts with a dilute acid.

The gas evolved when a metal reacts with dilute acid is hydrogen gas.

ScienceClass 8ICSE

An element forms an oxide which is basic in nature. State whether the element is a metal or a non- metal?

Answer An element that forms an oxide which is basic in nature is a metal. This is because metallic oxides are basic in nature and they react with water to form bases.

ScienceClass 8ICSE

Name the gas evolved when a metal reacts with water.

Answer The gas evolved when a metal reacts with water is hydrogen gas.

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