Exercise III on Elements, Compounds, Symbols and Formulae Class 6 Concise Chemistry ICSE Solutions Ch-4. In this article you would learn how to solve Exercise III on Elements, Compounds, Symbols and Formulae with hint and reason. Visit official Website CISCE for detail information about ICSE Board Class-6.
Exercise III on Elements, Compounds, Symbols and Formulae Class 6 Concise Chemistry ICSE Solutions
| Board | ICSE |
| Publications | Selina Publication |
| Subject | Chemistry |
| Class | 6th |
| Chapter-4 | Elements, Compounds, Symbols and Formulae |
| Book Name | Concise |
| Topics | Solution of Exercise III |
| Academic Session | 2025-2026 |
Exercise III on Elements, Compounds, Symbols and Formulae
Objective Type Questions
Que-1: Gold is used to make jewellery because it is:
(i) dull
(ii) lustrous and attractive
(iii) highly reactive
(iv) very cheap
Ans- lustrous and attractive
Reason — The gold is used to make jewellery because it is lustrous. It looks shiny and attractive and do not tarnish in air.
Que-2: Brass and bronze are:
(i) elements
(ii) mixtures
(iii) compounds
(iv) all of the above
Ans- mixtures
Reason — Brass is a mixture of copper and zinc and bronze is a mixtures of copper and tin.
Que-3: The hardest naturally occuring substance is:
(i) graphite
(ii) iron
(iii) diamond
(iv) coal
Ans- diamond
Reason — Diamond is a form of carbon, it is hardest naturally occuring substance. Hence, it is used to cut glass.
Que-4: The inert gas filled in electric bulbs is:
(i) Helium
(ii) Argon
(iii) Neon
(iv) Both (ii) and (iii)
Ans- Both (ii) and (iii)
Reason — Nobel gases (Inert gases) like argon and neon are filled in electric bulbs due to their inert nature. They do not react with the tungsten filament of the bulb and prevents it from destruction.
Que-5: Which of the following metals is used to make heavy tools and machines?
(i) Iron
(ii) Aluminium
(iii) Copper
(iv) Silver
Ans- Iron
Reason — Iron is strong and easily available. Therefore, it is used to make heavy tools and machines.
Fill in the blanks
Que-1: …………… refers to the number of atoms in the molecule of an element.
Ans- Atomicity refers to the number of atoms in the molecule of an element.
Que-2: The most abundant element in the earth’s crust is …………… .
Ans- The most abundant element in the earth’s crust is oxygen.
Que-3: A metal which is a liquid at room temperature is …………… .
Ans- A metal which is a liquid at room temperature is mercury.
Que-4: The most abundant element in the atmosphere is …………… .
Ans- The most abundant element in the atmosphere is nitrogen.
Que-5: A metal which is a poor conductor of electricity is …………… .
Ans- A metal which is a poor conductor of electricity is lead.
Que-6: A diatomic gaseous element is …………… .
Ans- A diatomic gaseous element is oxygen(O2).
Que-7: A liquid non-metal is …………… .
Ans- A liquid non-metal is bromine.
Que-8: Elements that do not react chemically are …………… .
Ans- Elements that do not react chemically are nobel gases.
Que-9: The Latin name of iron is …………… .
Ans- The Latin name of iron is ferrum.
Que-10: The horizontal rows in the Periodic table are called …………… .
Ans- The horizontal rows in the Periodic table are called periods.
Que-11: The vertical columns in the Periodic table are called …………… .
Ans- The vertical columns in the Periodic table are called groups.
State True or False
Indicate whether the following statements are true or false.
Que-1: A compound is made up of just one kind of atom. ……………
Ans- False
Correct Statement — A compound is made of two or more different kinds of atoms.
Que-2: Metals reflect light and are good conductors of electricity. ……………
Ans- True
Que-3: Metals can be polished. ……………
Ans- True
Que-4: Elements are made up of compounds. ……………
Ans- False
Correct Statement — Compounds are made up of elements.
Que-5: All elements are artificially prepared. ……………
Ans- False
Correct Statement — Compounds are made up of elements.
Que-6: Molecules can exist independently. ……………
Ans- True
Que-7: Molecules combine to form atoms. ……………
Ans- False
Correct Statement — Atoms combine to form molecules.
Que-8: Noble gases are highly reactive. ……………
Ans- False
Correct Statement — Noble gases are inert, i.e., non-reactive under normal conditions.
Que-9: Ozone is a triatomic molecule. ……………
Ans- True
Match the Following
| Column A | Column B |
|---|---|
| (a) Metals | (i) Non-reactive |
| (b) Molecules | (ii) Brittle |
| (c) Non-metals | (iii) Lustrous |
| (d) Nobel gases | (iv) Smallest unit of compound |
(b)- (iv)
(c)- (ii)
Select the Odd One
Circle the odd one out on the basis of the property given in the brackets.
Que-1: hydrogen, nitrogen, chlorine, phosphorus (state)
Ans- Phosphorus
Reason — Phosphorus is present in solid state under normal conditions, whereas, hydrogen, nitrogen, and chlorine are gases at room temperature.
Que-2: sodium, potassium, iron, lithium (hardness)
Ans- Iron
Reason — Iron is hard metal, while, sodium, potassium and lithium are soft metals.
Que-3: graphite, diamond, iodine, coal (forms of a same element)
Ans- Iodine
Reason — Coal, diamond and graphite are all different forms of carbon but iodine is a different element.
Que-4: helium, neon, argon, bromine (reactivity)
Ans- Bromine
Reason — Bromine is a reactive element. While, helium, neon and argon are non-reactive nobel gases.
Short Answer Type Questions
Que-1: Name:
(i) Three different forms of carbon.
(ii) A form of carbon used as a gem.
(iii) Two substances used to make electric wires.
(iv) Two substances used to make jewellery.
(v) A substance used as an insulator.
Ans- (i) Coal, diamond and graphite.
(ii) Diamond
(iii) Copper and aluminium
(iv) Gold and platinum
(v) Wood or Plastic
Que-2: Give one use of each of the following substances:
(i) Iron
(ii) Brass
(iii) Coal
Ans- (i) Iron is used to make machines, tools, and construction materials such as bridges and buildings.
(ii) Brass is used to make musical instruments like trumpets and horns.
(iii) Coal is used as a fuel to produce electricity in thermal power plants.
Long Answer Type Questions
Que-1:(i) Give reason:
A frying pan is made up of steel but its handle is made up of wood.
Ans- A frying pan is made of steel because steel is a good conductor of heat, which helps the food cook properly. Its handle is made of wood because wood is a poor conductor of heat (an insulator), so it does not get hot quickly and can be held safely without burning the hand.
(ii) Give reason:
Graphite is used to make lead of the pencils.
Ans- Graphite is used to make the lead of pencils because it is soft and slippery. Its layers slide easily over each other and leave a black mark on paper, which makes it suitable for writing.
(iii) Give reason:
Argon is filled in electric bulbs.
Ans- Argon is filled in electric bulbs because it is an inert (non-reactive) gas. It does not react with the hot filament of the bulb and prevents it from burning quickly, thereby increasing the life of the bulb.
(iv) Give reason:
Copper and aluminium are used to make electric wires.
Ans- Copper and Aluminium are used to make electric wires because they are good conductors of electricity. They allow electric current to pass through them easily and can also be drawn into thin wires.
Que-2: What do you understand by the statement — ‘Metals are ductile and malleable? Give one example of each.
Ans- Metals are ductile and malleable means:
Ductile: Metals can be drawn into thin wires.
Example: Copper is used to make electric wires.
Malleable: Metals can be beaten into thin sheets.
Example: Aluminium is beaten into thin sheets to make aluminium foil.
Que-3: (i) What do you understand by ‘Periodic Table’.
(ii) A part of the Periodic table is given below with the symbols of some elements. Write the symbols of the missing elements.
Ans- (i) The Periodic Table is a table in which all chemical elements are arranged in order of their increasing atomic number. The elements are placed in rows (periods) and columns (groups) so that elements with similar properties come in the same group.
(ii)
— : End of Exercise III on Elements, Compounds, Symbols and Formulae Class 6 Concise Chemistry ICSE Solutions :–
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