NCERT Class VIII Science Solutions: Chapter 4-Materials: Metals and Non-Metals Part 3

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VERY SHORT ANSWER QUESTIONS

Question 13:

Name two soft metals which can be cut with a knife.

Answer:

  1. Sodium

  2. Potassium

Question 14:

Which non-metal is essential for our life and all living beings inhale it during breathing?

Answer:

Oxygen gas

Question 15:

Name two major non-metals which are present in fertilisers and enhance the growth of plants.

Answer:

  1. Nitrogen

  2. Phosphorus

Question 16:

Which non-metal is used to disinfect water?

Answer:

Chlorine which is a non – metal, is used in water purification plants because chlorine has the ability to kill germs.

Question 17:

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

Answer:

Iodine

Question 18:

Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

Answer:

No, because displacement reaction does not takes place.

Question 19:

Why are bells made of metals?

Answer:

Metals are sonorous property. Ringing sound produce by metals is known as sonorous. So, the bells are made of metals.

Question 20:

Which liquid metal is used for making thermometers?

Answer:

Mercury

Image of thermometers

Thermometers

Image of thermometers