ICSE Class 9 Chemistry quarterly tests: direct answer
ICSE Class 9 Chemistry prepares students for formula writing, balanced equations, gas-law numericals, atomic structure and environmental chemistry. The ICSE Class 9 Chemistry Quarterly Tests PDF files on this page are useful as timed practice papers because they show how schools test these chapters in short-answer, equation-based and numerical formats.
Quarterly tests are school-level assessments, not centrally conducted CISCE board examinations. Use them as diagnostic papers: they show what you have understood, which formulas you still confuse, and which answer steps need more practice before half-yearly or annual exams.
Download ICSE Class 9 Chemistry Quarterly Tests PDF
The download table below preserves the existing PDF resources for this page. Open a paper in a new tab, read the instructions printed on that paper, and follow the time limit given by your school or teacher.
| Year | Paper Type | Title | Download |
|---|---|---|---|
| 2023 | Quarterly Test | First Quarterly Chemistry | Download |
| 2019 | Quarterly Test | Qty Chemistry | Download |
| 2018 | Quarterly Test | Qty Chemistry | Download |
These papers should be used with the latest syllabus followed by your school. For official syllabus notices and regulations, check the CISCE official website.
What do these Chemistry quarterly papers test?
The available Chemistry quarterly papers show a clear pattern: students are not asked only to memorise definitions. They are expected to write correct symbols, form chemical formulae from valencies, balance equations, name reaction types, solve gas-law numericals and explain observations.
| Skill tested | What the student must know | Typical error to avoid |
|---|---|---|
| Radicals and formulae | Symbols and valencies of radicals such as bicarbonate, sulphate, chlorate and nitrate | Writing a correct name but an incorrect charge |
| Balancing equations | Use coefficients to equalise atoms on both sides of the reaction | Changing subscripts inside a formula |
| Reaction types | Recognise decomposition, displacement, precipitation, neutralisation and photochemical reactions | Naming every reaction as combination or decomposition without checking reactants and products |
| Gas laws | Use P_1V_1/T_1 = P_2V_2/T_2, Boyle’s law or Charles’ law as needed | Using Celsius directly instead of Kelvin temperature |
| Atomic structure | Electronic configuration, atomic number, mass number and valency | Confusing electrons in shells with valency |
| Environmental chemistry | Acid rain, greenhouse effect, ozone layer and pollutants such as oxides of sulphur and nitrogen | Writing effects without naming the pollutant or the chemical change |
Concept snapshot: Chemistry has three layers
Think of an ICSE Class 9 Chemistry answer as a three-layer structure. The first layer is the language of Chemistry: symbols, radicals and formulae. The second layer is the grammar: balanced equations and reaction types. The third layer is the meaning: observations, explanations and applications such as acid rain or gas laws. Most quarterly-test mistakes happen when a student knows one layer but skips another.
What pattern is visible in the available papers?
The available Chemistry quarterly papers on this page are marked for 80 marks. The 2023 paper shows Section A for 40 marks and Section B for 40 marks; the older quarterly papers also use an 80-mark format with reading time printed on the paper. This is a pattern in the uploaded school papers, not a universal CISCE rule for every school.
| Part of paper | What it usually contains | How to prepare |
|---|---|---|
| Short-answer section | Symbols, formulae, one-line definitions, reaction types and observations | Make a daily list of radicals, ions, compounds and colour changes |
| Structured-answer section | Balanced equations, gas-law numericals, percentage composition and reasoning questions | Practise full working, not only final answers |
| Application questions | Acid rain, ozone depletion, greenhouse effect, water hardness and pollutant control | Write cause, chemical idea and effect in separate sentences |
ICSE Class 9 Chemistry topic map for revision
The exact order of chapters can vary by textbook and school plan. The topics below match the standard Class 9 Chemistry treatment used in ICSE schools and the question types visible in the quarterly-test PDFs.
| Revision area | Key points to revise | One quick self-check |
|---|---|---|
| Matter and chemical change | Physical change, chemical change, law of conservation of mass and balancing equations | Can you balance Fe_2O_3 + CO \rightarrow Fe + CO_2? |
| Elements, compounds and mixtures | Elements, compounds, mixtures, separation methods, symbols and formulae | Can you write the formula of calcium bicarbonate? |
| Atomic structure | Protons, neutrons, electrons, atomic number, mass number and electronic configuration | Can you find the number of neutrons in an isotope when A and Z are given? |
| Periodic table and valency | Groups, periods, valence electrons and combining capacity | Can you decide the valency from the outer-shell electrons? |
| Hydrogen and reactions | Preparation, properties, displacement reactions and balanced equations involving hydrogen | Can you explain why hydrogen is collected over water? |
| Water and salts | Hardness of water, crystallisation, hydrates, drying agents and salts | Can you calculate water of crystallisation as a percentage? |
| Atmospheric pollution | Air pollution, acid rain, ozone layer depletion, greenhouse gases and global warming | Can you name two pollutants that cause acid rain? |
Worked examples for ICSE Class 9 Chemistry tests
The examples below are original practice solutions based on the same question styles that appear in the uploaded Class 9 Chemistry quarterly papers. Use the layout as a model for writing answers in your notebook.
Worked Example 1: Balance common Chemistry equations
Question: Balance the following equation: Fe_2O_3 + CO \rightarrow Fe + CO_2.
Step 1: Count atoms on the left and right. Left side has 2 iron atoms and 3 oxygen atoms from Fe_2O_3, plus 1 oxygen atom from CO.
Step 2: Put coefficient 2 before Fe because Fe_2O_3 contains 2 iron atoms.
Fe_2O_3 + CO \rightarrow 2Fe + CO_2
Step 3: Balance carbon monoxide and carbon dioxide. Three CO molecules give three carbon atoms and three oxygen atoms; these form three CO_2 molecules along with the oxygen from Fe_2O_3.
Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2
Final answer: Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2.
Worked Example 2: Gas-law numerical from quarterly-test style
Question: A gas has a volume of 2.5\,L at S.T.P. Find its volume at 2\,atm and 227^\circ C.
Step 1: Write the given values. At S.T.P., take P_1 = 1\,atm, T_1 = 273\,K, and V_1 = 2.5\,L.
Step 2: Convert temperature into Kelvin.
T_2 = 227 + 273 = 500\,K
Step 3: Use the combined gas equation.
\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}
Step 4: Substitute the values and solve for V_2.
V_2 = \frac{P_1V_1T_2}{P_2T_1} = \frac{1 \times 2.5 \times 500}{2 \times 273}
V_2 = \frac{1250}{546} = 2.29\,L
Final answer: The volume of the gas is 2.29\,L approximately.
Worked Example 3: Percentage composition of phosphorus
Question: Calculate the percentage composition of phosphorus in \(Ca_3(PO_4)_2\). Given: Ca = 40, P = 31, O = 16.
Step 1: Find the molecular mass of \(Ca_3(PO_4)_2\).
\text{Molecular mass} = 3(40) + 2(31 + 4 \times 16)
= 120 + 2(31 + 64) = 120 + 190 = 310
Step 2: Find the mass of phosphorus present in one formula unit.
\text{Mass of phosphorus} = 2 \times 31 = 62
Step 3: Use the percentage formula.
\% \text{ of phosphorus} = \frac{62}{310} \times 100 = 20\%
Final answer: Phosphorus forms 20\% of \(Ca_3(PO_4)_2\) by mass.
Worked Example 4: Water of crystallisation in Epsom salt
Question: Find the percentage mass of water in MgSO_4\cdot 7H_2O. Given: Mg = 24, S = 32, O = 16, H = 1.
Step 1: Calculate the mass of MgSO_4.
MgSO_4 = 24 + 32 + 4(16) = 120
Step 2: Calculate the mass of 7H_2O.
7H_2O = 7 \times (2 \times 1 + 16) = 7 \times 18 = 126
Step 3: Calculate the total formula mass.
MgSO_4\cdot 7H_2O = 120 + 126 = 246
Step 4: Find the percentage of water.
\% \text{ of water} = \frac{126}{246} \times 100 = 51.22\%
Final answer: Water forms 51.22\% of MgSO_4\cdot 7H_2O by mass.
Worked Example 5: Acid rain reaction with marble
Question: Write a balanced equation to show how sulphuric acid in acid rain attacks marble or limestone.
Step 1: Marble and limestone mainly contain calcium carbonate, CaCO_3.
Step 2: Sulphuric acid reacts with calcium carbonate to form calcium sulphate, water and carbon dioxide.
CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2
Step 3: Check atoms: each side has 1 calcium atom, 1 sulphur atom, 1 carbon atom, 2 hydrogen atoms and 7 oxygen atoms.
Final answer: CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2.
Examiner’s mindset for Class 9 Chemistry answers
In Chemistry, method marks are often easier to protect than final-answer marks. A teacher can usually see your understanding when you write the formula, substitute values, balance the equation and state the final unit.
- For equations: write the unbalanced equation first only if needed, then the balanced equation. Do not change a chemical formula to force balancing.
- For numericals: convert ^\circ C to K, keep pressure units consistent, show substitution and include the final unit.
- For environmental Chemistry: write the pollutant, the process and the effect. For acid rain, mention oxides of sulphur or nitrogen before writing the damage caused.
- For observation questions: give the visible change first, then the inference if asked. Example: a black precipitate forms when H_2S is passed through copper sulphate solution because CuS is formed.
How to practise these PDFs without wasting time
Do not solve all papers in one sitting. Use each Chemistry paper as a separate check of your preparation.
- Revise the chapter list first. Spend 20 to 30 minutes on radicals, valency, equations and formulas before attempting the paper.
- Attempt the paper closed-book. Keep your textbook away so that the test shows your actual recall.
- Mark in three colours. Use one colour for formula mistakes, one for calculation mistakes and one for explanation mistakes.
- Redo only the wrong questions the next day. This helps you fix errors without wasting time on answers you already know.
- Compare with syllabus coverage. If your school has not yet taught a topic, mark it as pending instead of guessing.
For wider practice, use the ICSE Class 9 Quarterly Tests PDF collection and then move to ICSE Class 9 Chemistry previous year papers for longer revision.
Common mistakes students make in Chemistry tests
- Changing subscripts while balancing: H_2O cannot become H_2O_2 just to balance oxygen. Change coefficients only.
- Forgetting Kelvin conversion: Gas-law numericals require K = ^\circ C + 273. Using 227 instead of 500\,K changes the answer.
- Writing charges as valencies without thinking: Valency is combining capacity. Learn common radicals with both name and charge.
- Mixing thermal decomposition and thermal dissociation: Decomposition is usually a more permanent breakdown by heat, while dissociation is often reversible under suitable conditions.
- Giving vague pollution answers: Do not write only “pollution harms plants”. For acid rain, mention oxides of sulphur and nitrogen, acid formation, and one specific effect such as soil acidity or damage to limestone.
- Leaving equations unbalanced in observation answers: If an equation is expected, write the balanced form. For example, CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2.
Related ICSE Class 9 Chemistry resources
Use these related pages when you want to move from quarterly-test practice to full revision:
- Class 9 Quarterly Tests for all subjects
- ICSE Class 9 Chemistry previous year papers
- ICSE Class 9 Chemistry assessment papers
- ICSE Class 9 books and solutions
- ICSE Class 9 syllabus
Frequently Asked Questions
Are ICSE Class 9 Chemistry quarterly tests official CISCE board papers?
No. ICSE Class 9 Chemistry quarterly tests are usually school-conducted term papers. They should follow the CISCE syllabus, but the exact chapters, duration and internal marking pattern can vary from school to school.
How should I use the ICSE Class 9 Chemistry Quarterly Tests PDF at home?
Use the ICSE Class 9 Chemistry Quarterly Tests PDF as a timed practice paper. First revise the chapters taught in your school, then attempt the paper without notes, mark every wrong formula or equation, and redo those questions after two or three days.
Which Chemistry topics appear often in Class 9 quarterly tests?
The available Class 9 Chemistry quarterly papers commonly test radicals, chemical formulae, balancing equations, reaction types, gas laws, atomic structure, valency, salts, hydrogen-related reactions, water and atmospheric pollution. Your school may add or remove topics depending on the term syllabus.
What is the safest way to balance chemical equations in ICSE Class 9 Chemistry?
Balance one element at a time, keep subscripts unchanged, and use coefficients only. For example, the equation Fe_2O_3 + CO \rightarrow Fe + CO_2 becomes Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2.
Why do students lose marks in Chemistry gas-law numericals?
Students usually lose marks because they forget to convert Celsius to Kelvin, mix pressure units, or leave out the final unit. In ICSE Class 9 Chemistry, write the formula first, substitute values clearly, and state the final volume or pressure with the correct unit.
Does atmospheric pollution come in Class 9 Chemistry tests?
Yes, atmospheric pollution can appear as short-answer or reasoning questions. Students should know acid rain, greenhouse gases, ozone layer depletion and balanced equations such as CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2.