Exercise I on Elements, Compounds, Symbols and Formulae Class 6 Concise Chemistry ICSE Solutions Ch-4. In this article you would learn how to solve Exercise I on Elements, Compounds, Symbols and Formulae with hint and reason. Visit official Website CISCE for detail information about ICSE Board Class-6.
Exercise I 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 I |
| Academic Session | 2025-2026 |
Exercise I on Elements, Compounds, Symbols and Formulae
Objective Type Questions
Que-1: All pure substances have:
(i) the same physical state
(ii)the same colour
(iii)the same composition
(iv)a definite set of properties
Ans- a definite set of properties
Reason — All pure substance have a definite set of property, which includes their physical state, colour and composition but it is not same for all the substances.
Que-2: Sugar is a compound which consists of the elements:
(i)carbon and hydrogen
(ii)hydrogen and oxygen
(iii)carbon, hydrogen and oxygen
(iv)hydrogen, carbon and sulphur
Ans- carbon, hydrogen and oxygen
Reason — Sugar has the chemical formula C12H22O11, which signifies that it is made up of carbon (C), hydrogen (H) and oxygen (O).
Que-3: Sulphur and carbon are:
(i)metals
(ii)non-metals
(iii)metalloids
(iv)noble gases
Ans- non-metals
Reason — Sulphur and carbon are non-metals with dull surfaces that do not shine.
Que-4: The most abundant elements in the universe are:
(i)neon and argon
(ii)hydrogen and helium
(iii)aluminium and copper
(iv)oxygen and nitrogen
Ans- hydrogen and helium
Reason — The most abundant elements in the universe are hydrogen and helium.
Que-5: The symbol of which of the following elements is derived from its Latin name ?
(i)Cobalt
(ii)Copper
(iii)Calcium
(iv)Chlorine
Ans- Copper
Reason — Among the following elements the symbol of copper i.e., Cu is derived from its latin name “Cuprum”.
Que-6: The metal which is not a good conductor of electricity is:
(i)silver
(ii)aluminium
(iii)copper
(iv)tungsten
Ans- tungsten
Reason — Metals are good conductors of electricity excepting tungsten, which is a poor conductor of electricity.
Que-7: The symbol of sodium metal is:
(i)S
(ii)Sn
(iii)Na
(iv)Ne
Ans- Na
Reason — The symbol of sodium metal is Na is derived from “Natrium”.
From the list given below, select the correct substance which is most suitable to the given statements
(oxygen, diamond, zinc, graphite, gold)
Que-1: A metal which is brittle.
Ans- Zinc
Que-2: A non-metal which is a good conductor of electricity.
Ans- Graphite
Que-3: The hardest naturally occurring substance.
Ans- Diamond
Que-4: The most ductile metal.
Ans- Gold
Que-5: A gaseous non-metal.
Ans- Oxygen
Classify the following substances into elements and compounds.
Que: Mercury, sulphur, sugar, water, sand, gold, carbon, oxygen, alcohol, iron, marble, baking soda.
Ans- (i) Elements — Mercury, sulphur, gold, carbon, oxygen, iron
(ii) Compounds — Sugar, water, sand, alcohol, marble, baking soda
Que: Give the symbols of: carbon, calcium, copper, chlorine, cobalt, argon, silicon, aluminium.
Ans- (i) Carbon — C
(ii) Calcium — Ca
(iii) Copper — Cu
(iv) Chlorine — Cl
(v) Cobalt — Co
(vi) Argon — Ar
(vii) Silicon — Si
(viii) Aluminium — Al
Que: Give the names of the elements represented by the following symbols:
(i) B
(ii) He
(iii) Si
(iv) Be
(v) Li
(vi) P
(vii) K
(viii) F
Ans- (i) B — Boron
(ii) He — Helium
(iii) Si — Silicon
(iv) Be — Beryllium
(v) Li — Lithium
(vi) P — Phosphorus
(vii) K — Potassium
(viii) F — Fluorine
Short Answer Type Questions
Que-1: Define a pure substance.
Ans- A Pure Substance is a form of matter that has a fixed chemical composition and uniform properties throughout. It consists of only one type of particle (either a single element or a single compound) and cannot be separated into simpler substances by physical methods.
Que-2: Name the types of pure substances you know.
Ans- Pure substances are of two types :
(i) Elements
(ii) Compounds
Que-3: Define:
(i) Elements
(ii) Compounds.
Ans- (i) Element: An element is a pure substance made up of only one type of atom and cannot be broken down into simpler substances by chemical means.
(ii) Compound: A compound is a pure substance formed when two or more elements chemically combine in a fixed proportion.
Que-4: Give two examples for each of the following:
(i) Non-metals which are solids
(ii) Metals which are soft
(iii) Non-metals which are lustrous
(iv) Elements which are liquids
(v) Inert gases
Ans- (i) Non-metals which are solids:
(a) Sulfur
(b) Phosphorus
(ii) Metals which are soft:
(a) Sodium
(b) Potassium
(iii) Non-metals which are lustrous:
(a) Iodine
(b) Carbon
(iv) Elements which are liquids:
(a) Mercury
(b) Bromine
(v)Inert gases:
(a) Helium
(b) Neon.
Que-5: Name the elements present in the following compounds.
(i) Sugar
(ii) Ammonia
(iii) Marble
(iv) Washing soda
Ans- (i) Sugar — Carbon, hydrogen and oxygen
(ii) Ammonia — Nitrogen and hydrogen
(iii) Marble — Calcium, carbon and oxygen
(iv) Washing soda — Sodium, carbon and oxygen
Long Answer Type Questions
Que-1: (i) Give three differences between metals and non-metals
(ii) Give three differences between elements and compounds.
Ans- (i) The differences between metals and non-metals are given below:
| Metals | Non-metals |
|---|---|
| Metals are usually lustrous | Non-metals are non lustrous |
| They have high melting and boiling points |
They have low melting and boiling points |
| Metals are ductile | Non-metals are not ductile |
| Metals have high density | Non-metals have low density |
(ii) The differences between elements and compounds are given below:
| Elements | Compounds |
|---|---|
| An element is made up of only one kind of atoms. | A compound is made up of two or more atoms of different elements combined chemically in a definite whole number ratio by mass. |
| An element has its own set of properties. | The properties of a compound are completely different from those of its constituent elements. |
| An element cannot be broken down into simpler substances by any physical or chemical means. | A compound can be broken into its constituent elements by chemical means. |
Que-2: Name the elements which form water. State three characteristics of water to justify that it is a compound.
Ans- Elements that form water: Water is formed from the elements Hydrogen and Oxygen. The compound formed is Water.
Three characteristics showing that water is a compound:
(i)The elements hydrogen and oxygen are chemically combined in a fixed ratio (2:1).
(ii)Water has properties different from its constituent elements.
(iii)The elements in water cannot be separated by physical methods, only by chemical methods (such as electrolysis).
Que-3: State four important characteristics of compounds.
Ans- Four important characteristics of a Compound are:
(i)A compound is formed when two or more elements chemically combine in a fixed ratio.
(ii)The properties of a compound are different from the properties of its constituent elements.
(iii)The elements in a compound cannot be separated by physical methods; they can be separated only by chemical reactions.
(iv)A compound is a homogeneous pure substance with a definite composition.
Que-4: How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
Ans- Sodium Chloride has properties very different from its constituent elements Sodium and Chlorine.
Justification:
(i)Sodium is a soft, highly reactive metal, while chlorine is a poisonous green gas. But sodium chloride is a stable white crystalline solid (common salt).
(ii)Sodium reacts violently with water and chlorine is toxic, whereas sodium chloride is safe to eat in small amounts and is used in food.
(iii)The physical state changes: sodium is a solid metal, chlorine is a gas, but sodium chloride is a solid crystal.
(iv)These differences show that a compound has properties different from the elements that form it.
Que-5: (i) What are the four types of elements ? Name them.
(ii) Give two examples of each type of the elements you have mentioned above.
(a)Metal
(b)Nonmetal
(c)Metalloid
(d)Noble Gas
(ii) Two examples of each:
(a)Metals: Iron, Copper
(b)Non-metals: Oxygen, Sulfur
(c)Metalloids: Silicon, Germanium
(d)Noble gases: Helium, Neon.
— : End of Exercise I on Elements, Compounds, Symbols and Formulae Class 6 Concise Chemistry ICSE Solutions :–
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