Chemistry Class 9 Worksheet with Answers & Notes

The Language of Chemistry (Symbols, Valency, Chemical Formulae, Equations)

Subtopic

The Language of Chemistry (Symbols, Valency, Chemical Formulae, Equations) under Chemistry for Grade 9 ICSE.

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1.
$Which of the following elements exhibits variable valency?$
A. $Sodium$
B. $Magnesium$
C. $Copper$
D. $Aluminium$
2.
$What is the symbol of the element Fluorine?$
A. $Fl$
B. $F$
C. $Fu$
D. $Fe$
3.
$Which of these represents a balanced equation for the formation of water?$
A. $H_{2} + O_{2} \rightarrow H_{2}O$
B. $2H_{2} + O_{2} \rightarrow 2H_{2}O$
C. $H_{2} + O \rightarrow H_{2}O$
D. $2H + O \rightarrow H_{2}O$
4.
$What is the formula of the radical Bicarbonate (or Hydrogen Carbonate)?$
A. $CO_{3}$
B. $HCO_{3}$
C. $C_{2}O_{4}$
D. $H_{2}CO_{3}$
5.
$M$
A. $MNO_{2}$
B. $M(NO_{2})_{2}$
C. $M_{2}NO_{2}$
D. $M(NO_{3})_{2}$
6.
$What is the correct formula for Ammonium Phosphate?$
A. $NH_{4}PO_{4}$
B. $(NH_{4})_{2}PO_{4}$
C. $(NH_{4})_{3}PO_{4}$
D. $NH_{4}(PO_{4})_{3}$
7.
$Which of the following represents the Latin name of Mercury?$
A. $Hydrargyrum$
B. $Argentum$
C. $Aurum$
D. $Natrium$
8.
$What is the chemical formula of Sodium Manganate?$
A. $NaMnO_{4}$
B. $Na_{2}MnO_{4}$
C. $Na(MnO_{4})_{2}$
D. $NaMn_{2}O_{4}$
9.
$4FeS_{2} + 11O_{2} \rightarrow 2Fe_{2}O_{3} + 8SO_{2}$
A. $11$
B. $22$
C. $16$
D. $6$
10.
$Ca_{3}(PO_{4})_{2}$
A. $20%$
B. $31%$
C. $15.5%$
D. $10%$

Download the worksheet for Chemistry - The Language of Chemistry (Symbols, Valency, Chemical Formulae, Equations) to practice offline. It includes additional chapter-level practice questions.

Chemical Changes and Reactions (Types of Reactions, Energy Changes)

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Chemical Changes and Reactions (Types of Reactions, Energy Changes) under Chemistry for Grade 9 ICSE.

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1.
$Which of the following is an example of a chemical combination reaction?$
A. $Burning of magnesium in oxygen$
B. $Heating calcium carbonate$
C. $Reaction of zinc with acid$
D. $Electrolysis of water$
2.
$A reaction that involves the decomposition of a compound by passing an electric current through it is called:$
A. $Photolysis$
B. $Thermolysis$
C. $Electrolysis$
D. $Neutralization$
3.
$When iron nails are placed in a blue copper sulfate solution, the color of the solution changes to:$
A. $Red$
B. $Light green$
C. $Yellow$
D. $Colorless$
4.
$Which of these is a sign that a chemical reaction has taken place?$
A. $Change in color$
B. $Evolution of a gas$
C. $Change in temperature$
D. $All of the above$
5.
$The following flowchart represents the thermal decomposition of two different metal nitrates. Based on the chemical properties of nitrates, identify the gases P and Q evolved during these reactions.$
A. $O_2$
B. $NO_2$
C. $O_2$
D. $N_2$
6.
$Effervescence is observed when:$
A. $A solid settles down in a liquid$
B. $Gas bubbles are rapidly evolved in a liquid$
C. $Two liquids of different densities are mixed$
D. $A solid melts into a liquid$
7.
$2KClO_3 \xrightarrow{\Delta, MnO_2} 2KCl + 3O_2$
A. $Thermal decomposition$
B. $Double displacement$
C. $Combination$
D. $Single displacement$
8.
$KNO_{3}$
A. $Due to the evolution of Nitrogen dioxide$
B. $Due to the evolution of Oxygen gas$
C. $Due to the evolution of Nitric oxide$
D. $The salt itself is flammable$
9.
$BaCl_{2(aq)} + H_{2}SO_{4(aq)} \rightarrow BaSO_{4(s)} + 2HCl_{(aq)}$
A. $Neutralization$
B. $Double displacement and Precipitation$
C. $Thermal dissociation$
D. $Simple displacement$
10.
$PbO + C \rightarrow Pb + CO$
A. $+2 to 0$
B. $+4 to +2$
C. $0 to +2$
D. $+2 to +4$

Download the worksheet for Chemistry - Chemical Changes and Reactions (Types of Reactions, Energy Changes) to practice offline. It includes additional chapter-level practice questions.

Water (Physical/Chemical Properties, Hard and Soft Water)

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Water (Physical/Chemical Properties, Hard and Soft Water) under Chemistry for Grade 9 ICSE.

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1.
$FeSO_4.7H_2O$
A. $Blue$
B. $White$
C. $Green$
D. $Pink$
2.
$Adding impurities like common salt to water ______ its boiling point.$
A. $Decreases$
B. $Increases$
C. $Does not change$
D. $First increases then decreases$
3.
$Which substance is used to test for the presence of water because it turns from white to blue?$
A. $Anhydrous cobalt chloride$
B. $Anhydrous copper sulphate$
C. $Magnesium ribbon$
D. $Pink litmus paper$
4.
$Potable water must be free from:$
A. $Dissolved oxygen$
B. $Minerals$
C. $Harmful germs and bacteria$
D. $Taste$
5.
$Henry's Law relates the solubility of ______ in water to the ______ applied.$
A. $Solids, Pressure$
B. $Gases, Pressure$
C. $Liquids, Temperature$
D. $Solids, Temperature$
6.
$A crystal of a salt is dropped into its own saturated solution. If more crystals start forming, the original solution was:$
A. $Unsaturated$
B. $Saturated$
C. $Supersaturated$
D. $Dilute$
7.
$Which of the following is true about a supersaturated solution?$
A. $It is very stable and does not crystallize$
B. $It contains more solute than a saturated solution at that temperature$
C. $It is prepared by cooling an unsaturated solution$
D. $It is a heterogeneous mixture$
8.
$Which metal can decompose cold water to evolve Hydrogen gas?$
A. $Iron$
B. $Magnesium$
C. $Calcium$
D. $Copper$
9.
$Which of these is a property of a 'Drying Agent' like anhydrous Calcium chloride?$
A. $It removes water molecules from the chemical structure of a compound.$
B. $It removes moisture from the surface or surroundings without chemical change in the substance being dried.$
C. $It reacts with water to produce Oxygen gas.$
D. $It only works at temperatures above 100°C.$
10.
$What is the role of adding a small amount of sulfuric acid during the electrolysis of water?$
A. $To act as an oxidizing agent.$
B. $To increase the conductivity of water which is a poor conductor.$
C. $To prevent the evolution of Oxygen at the anode.$
D. $To react with the electrodes.$

Download the worksheet for Chemistry - Water (Physical/Chemical Properties, Hard and Soft Water) to practice offline. It includes additional chapter-level practice questions.

Atomic Structure and Chemical Bonding (Subatomic Particles, Isotopes, Octet Rule, Electrovalent/Covalent Bonds)

Subtopic

Atomic Structure and Chemical Bonding (Subatomic Particles, Isotopes, Octet Rule, Electrovalent/Covalent Bonds) under Chemistry for Grade 9 ICSE.

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1.
$CCl_4$
A. $Ionic$
B. $Covalent$
C. $Hydrogen bond$
D. $Metallic$
2.
$How many electrons are present in the valence shell of an Oxygen atom?$
A. $2$
B. $4$
C. $6$
D. $8$
3.
$Which shell is closest to the nucleus?$
A. $L shell$
B. $M shell$
C. $K shell$
D. $N shell$
4.
$NH_3$
A. $1$
B. $2$
C. $3$
D. $4$
5.
$Y$
A. $16$
B. $18$
C. $32$
D. $34$
6.
$_{1}^{1}H$
A. $Proton$
B. $Electron$
C. $Neutron$
D. $Nucleon$
7.
$The number of electrons in the outermost shell of an element with atomic number 19 is:$
A. $1$
B. $7$
C. $8$
D. $9$
8.
$Z=11$
A. $The number of shells remains the same; electrons decrease.$
B. $The number of shells decreases; electrons decrease.$
C. $The number of shells increases; electrons decrease.$
D. $The number of shells decreases; electrons increase.$
9.
$X$
A. $3$
B. $5$
C. $7$
D. $15$
10.
$CO_2$
A. $CO_2$
B. $CO_2$
C. $Both are equally soluble as they contain oxygen.$
D. $Linear molecules are always ionic.$

Download the worksheet for Chemistry - Atomic Structure and Chemical Bonding (Subatomic Particles, Isotopes, Octet Rule, Electrovalent/Covalent Bonds) to practice offline. It includes additional chapter-level practice questions.

The Periodic Table (Modern Periodic Law, Groups and Periods)

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The Periodic Table (Modern Periodic Law, Groups and Periods) under Chemistry for Grade 9 ICSE.

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1.
$What is the valency of the Noble gases in Group 18?$
A. $1$
B. $8$
C. $Zero$
D. $2$
2.
$Which of these elements is an Alkaline Earth Metal located in Period 2?$
A. $Magnesium$
B. $Calcium$
C. $Beryllium$
D. $Lithium$
3.
$Which of these elements is a Halogen located in Period 2?$
A. $Chlorine$
B. $Fluorine$
C. $Bromine$
D. $Iodine$
4.
$What is the atomic number of Carbon?$
A. $6$
B. $12$
C. $14$
D. $4$
5.
$If an element has only two shells and both are completely filled, the element is:$
A. $Helium$
B. $Neon$
C. $Argon$
D. $Lithium$
6.
$The transition from metallic to non-metallic character is most clearly observed as we move:$
A. $Down a group$
B. $From left to right across a period$
C. $From right to left across a period$
D. $From the center to the top of a group$
7.
$The Coinage metals (Copper, Silver, Gold) belong to which group in the periodic table?$
A. $Group 1$
B. $Group 10$
C. $Group 11$
D. $Group 12$
8.
$Which of the following trends is correct for the Halogen group (17) as we move from top to bottom?$
A. $\rightarrow$
B. $Reactivity: Increases$
C. $Electronegativity: Increases$
D. $Atomic Size: Decreases$
9.
$In the Modern Periodic Table, why are the Lanthanides and Actinides placed separately at the bottom of the table?$
A. $To prevent the table from becoming too wide and to keep elements with similar properties together$
B. $Because they do not have any protons$
C. $Because they belong to Group 18$
D. $Because they are all man-made elements$
10.
$Which of the following is not a periodic property?$
A. $Electronegativity$
B. $Atomic Mass$
C. $Ionization Energy$
D. $Valence Electrons$

Download the worksheet for Chemistry - The Periodic Table (Modern Periodic Law, Groups and Periods) to practice offline. It includes additional chapter-level practice questions.

Study of the First Element - Hydrogen (Preparation, Properties, Oxidation/Reduction)

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Study of the First Element - Hydrogen (Preparation, Properties, Oxidation/Reduction) under Chemistry for Grade 9 ICSE.

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Preview questions (no answers)

1.
$What is the mass of one mole of hydrogen atoms (approximately)?$
A. $1 g$
B. $2 g$
C. $16 g$
D. $4 g$
2.
$H_2$
A. $Ionic bond$
B. $Covalent bond$
C. $Metallic bond$
D. $Coordinate bond$
3.
$During the Bosch process, how is carbon dioxide removed from the mixture of gases?$
A. $By liquefaction$
B. $By dissolving in water under high pressure$
C. $By passing through ammoniacal cuprous chloride$
D. $By passing through concentrated sulphuric acid$
4.
$Liquid hydrogen finds significant application as a:$
A. $Cooking fuel$
B. $Refrigerant for domestic use$
C. $Rocket fuel$
D. $Solvent for paints$
5.
$PbO + H_{2} \rightarrow Pb + H_{2}O$
A. $H_{2}$
B. $PbO$
C. $Pb$
D. $H_{2}O$
6.
$Cr_{2}O_{3}$
A. $Catalyst$
B. $Promoter$
C. $Oxidizing agent$
D. $Dehydrating agent$
7.
$What happens when magnesium reacts with boiling water?$
A. $MgO$
B. $Mg(OH)_{2}$
C. $MgH_{2}$
D. $No reaction takes place$
8.
$PbO + C \rightarrow Pb + CO$
A. $Lead(II) oxide$
B. $Carbon$
C. $Lead$
D. $Carbon monoxide$
9.
$Which of the following statements about nascent hydrogen is correct, relative to ordinary molecular hydrogen?$
A. $It is less reactive because it has more energy$
B. $It is a more powerful reducing agent because it is in atomic form at the moment of birth$
C. $2000^{\circ}C$
D. $It is more stable and lasts for a longer duration$
10.
$H_{2}S + Cl_{2} \rightarrow 2HCl + S$
A. $From 0 to -2$
B. $From -2 to 0$
C. $From -2 to +2$
D. $From +2 to 0$

Download the worksheet for Chemistry - Study of the First Element - Hydrogen (Preparation, Properties, Oxidation/Reduction) to practice offline. It includes additional chapter-level practice questions.

Atmospheric Pollution (Acid Rain, Greenhouse Effect, Ozone Depletion)

Subtopic

Atmospheric Pollution (Acid Rain, Greenhouse Effect, Ozone Depletion) under Chemistry for Grade 9 ICSE.

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1.
$Which gas is primarily produced by the combustion of high-sulfur coal?$
A. $Methane$
B. $Sulfur dioxide$
C. $Nitrous oxide$
D. $Helium$
2.
$Which of the following reactions describes the formation of ozone?$
A. $O_{2} + O \rightarrow O_{3}$
B. $O_{2} + H_{2} \rightarrow H_{2}O$
C. $CO + O \rightarrow CO_{2}$
D. $N_{2} + O_{2} \rightarrow 2NO$
3.
$Which part of the plant is most directly damaged by the acidity of acid rain?$
A. $The fruit$
B. $The waxy cuticle of leaves$
C. $The root hair only$
D. $The seeds$
4.
$How does the 'Greenhouse Effect' benefit the Earth naturally?$
A. $It keeps the Earth's temperature warm enough to sustain life$
B. $It prevents all sunlight from reaching the Earth$
C. $It turns nitrogen into oxygen$
D. $It stops the movement of the moon$
5.
$The Kyoto Protocol was an international agreement primarily aimed at committing industrialized nations to reduce their emissions of:$
A. $Ozone-depleting substances$
B. $Greenhouse gases$
C. $Particulate matter$
D. $Heavy metals into water$
6.
$Which of the following is a natural source of sulfur dioxide in the atmosphere?$
A. $Photosynthesis by green plants$
B. $Volcanic eruptions$
C. $Nitrogen fixation by bacteria$
D. $Respiration by animals$
7.
$Increased carbon dioxide levels in the atmosphere lead to 'ocean acidification'. What is the primary biological consequence of this?$
A. $Increase in the rate of coral reef growth$
B. $Difficulty for marine organisms like mollusks to form calcium carbonate shells$
C. $Reduction in the temperature of the ocean water$
D. $Increase in the oxygen content of the water$
8.
$N_{2}O$
A. $Excessive use of nitrogenous fertilizers in agriculture.$
B. $Leaking air conditioning units.$
C. $Combustion of leaded petrol.$
D. $Incomplete combustion in coal power plants.$
9.
$When acid rain reacts with the silicate minerals in rocks (like feldspar), it releases which ion that can lead to the formation of clay minerals?$
A. $K^{+}$
B. $Cl^{-}$
C. $SO_{4}^{2-}$
D. $NO_{3}^{-}$
10.
$Which of these gases has the longest atmospheric residence time, contributing to long-term climate change over centuries?$
A. $Perfluorocarbons (PFCs)$
B. $CH_{4}$
C. $Water vapor$
D. $CO$

Download the worksheet for Chemistry - Atmospheric Pollution (Acid Rain, Greenhouse Effect, Ozone Depletion) to practice offline. It includes additional chapter-level practice questions.

Chemistry

The Language of Chemistry (Symbols, Valency, Chemical Formulae, Equations)

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Chemical Changes and Reactions (Types of Reactions, Energy Changes)

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Water (Physical/Chemical Properties, Hard and Soft Water)

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Atomic Structure and Chemical Bonding (Subatomic Particles, Isotopes, Octet Rule, Electrovalent/Covalent Bonds)

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The Periodic Table (Modern Periodic Law, Groups and Periods)

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Study of the First Element - Hydrogen (Preparation, Properties, Oxidation/Reduction)

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Atmospheric Pollution (Acid Rain, Greenhouse Effect, Ozone Depletion)

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