SEBA Class 7 Science Chapter 8 Concept of Metals and Non – Metals

SEBA Class 7 Science Chapter 8 Concept of Metals and Non – Metals Solutions English Medium As Per SCERT New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 7 Science Chapter 8 Concept of Metals and Non – Metals Notes and select need one. SEBA Class 7 Science Textual Notes Download PDF. SCERT Class 7 Science New Textbook Question Answer in English.

SEBA Class 7 Science Chapter 8 Concept of Metals and Non – Metals

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Concept of Metals and Non – Metals

Chapter: 8

PART – II

EXERCISES

1. Darken the circle of the correct answer:

(i) Which of the following is not applicable to iron?

(a) Sonorous.

(b) Dull.

(c) Malleable.

(d) Ductile.

Ans: (b) Dull.

(ii) Which of the following metal reacts vigorously with water and then catch fire?

(a) Magnesium.

(b) Copper.

(c) Sodium.

(d) Uranium.

Ans: (c) Sodium.

(iii) Which metal is commonly used to make food packaging materials as it is cheaper, and its thin sheets can be folded easily into any shape?

(a) Aluminium.

(b) Copper.

(c) Iron.

(d) Gold.

Ans: (a) Aluminium.

(iv) Which of the following is formed when the residue obtained on burning sulphur is mixed with water?

(a) Sulphuric acid.

(b) Sulphurous acid.

(c) Sulphonic acid.

(d) sulphur dioxide.

Ans: (b) Sulphurous acid.

(v) Bronze is an alloy of:

(a) Copper and zinc.

(b) Copper and iron.

(c) Tin and zine.

(d) Tin and copper.

Ans: (d) Tin and copper.

2. Fill-up the blanks:

(i) The non-metal that is used as an antiseptic in skin ointments is __________.

Ans: The non-metal that is used as an antiseptic in skin ointments is iodine.

(ii) The metals present in bell metal are ___________ and ____________.

Ans: The metals present in bell metal are copper and tin.

(iii) ____________ is a metal which is liquid at room temperature.

Ans: Mercury is a metal which is liquid at room temperature.

(iv) A non-metal that is a good conductor of heat and electricity is ______________.

Ans: A non-metal that is a good conductor of heat and electricity is graphite.

(v) The property of a metal which is useful in making tin sheets is _______________.

Ans: The property of a metal which is useful in making tin sheets is malleability.

3. State with reasons whether the following statements are true or false.

(i) Aluminium and copper are examples of non-metals used for making utensils and statues.

Ans: False.

Reason: Aluminium and copper are metals, not non-metals. They are used because metals are strong, malleable, and good conductors of heat.

(ii) Metals form oxides when combined with oxygen, the solution of which turns blue litmus paper to red.

Ans: False.

Reason: Metal oxides are basic in nature, so their solutions turn red litmus paper blue, not blue to red.

(iii) Oxygen is a non-metal essential for respiration.

Ans: True.

Reason: Oxygen is a non-metal and is necessary for respiration in living organisms to release energy.

(iv) Copper vessels are used for boiling water because they are good conductors of electricity.

Ans: False.

Reason: Copper vessels are used because copper is a good conductor of heat, not electricity.

(v) School bell is made of bell metal because this metal is ductile.

Ans: False.

Reason: Bell metal is used because it is sonorous (produces a ringing sound), not because it is ductile.

(vi) The black part present in hard pencil is a metal that conducts electricity.

Ans: False.

Reason: The black part is graphite, which is a non-metal form of carbon. Though it conducts electricity, it is not a metal.

4. Match Column I with Column II:

Column I	Column II
1. Malleable	(a) Can be transformed into wire
2. Ductile	(b) For making crackers
3. Oxygen	(c) Give sheets on hammering
4. Copper	(d) For disinfecting water
5. Sulphur	(e) All living beings inhale during breathing
6. Diamond	(f) For making electric wires
7. Sonority	(g) For making rails
8. Iron	(h) Hardest non-metal
9. Chlorine	(i) Ringing of bells
10. Platinum	(j) Used in making ornaments

Ans: 

Column I	Column II
1. Malleable	(c) Give sheets on hammering
2. Ductile	(a) Can be transformed into wire
3. Oxygen	(e) All living beings inhale during breathing
4. Copper	(f) For making electric wires
5. Sulphur	(b) For making crackers
6. Diamond	(h) Hardest non-metal
7. Sonority	(i) Ringing of bells
8. Iron	(g) For making rails
9. Chlorine	(d) For disinfecting water
10. Platinum	(j) Used in making ornaments