Check how ready you are with our Class 11 Chemistry online mock tests, made for the CBSE 2026-27 session. These free tests give you your score right after you submit, so you know exactly where you stand in Chemistry.
Chapter Tests for Class 11 Chemistry
Each chapter of Chemistry in Class 11 has its own test below, built around the current CBSE 2026-27 marking scheme. Click to begin instantly. No login, and no limit on retakes.
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Class 11 Chemistry: Concept Navigators & Chapter Diagnostic Tests Select any chapter below to use real-time chemistry calculators and solve high-yield CBSE diagnostic questions with verified explanations. Interactive Concept Tool: Mole & Particle Count Calculator Q1.What is the mass of 1 mole of oxygen atoms (O)? Answer: (a) 16 g. The atomic mass of oxygen is 16 u, so 1 mole of oxygen atoms (not O₂ molecules) has a mass of 16 g.
Q2.Which law states that equal volumes of gases, at the same temperature and pressure, contain equal numbers of molecules? Answer: (a) Avogadro's Law. This principle underlies the concept of molar volume (22.4 L at STP for any ideal gas).
Q3.In a chemical reaction, the reactant that is completely consumed and determines the amount of product formed is called the: Answer: (c) Limiting reagent. Once the limiting reagent is used up, the reaction stops, regardless of how much of the other reactant remains.
Interactive Concept Tool: Subshell Electron Capacity Finder Q1.What is the maximum number of electrons that a single orbital can hold? Answer: (b) 2. By the Pauli Exclusion Principle, an orbital can hold a maximum of two electrons, and they must have opposite spins.
Q2.According to the Aufbau Principle, electrons are filled into orbitals in order of: Answer: (a) Increasing (n + l) value. When two orbitals have the same (n + l) value, the one with lower n is filled first (e.g., 4s fills before 3d).
Q3.Which quantum number determines the shape of an orbital? Answer: (b) Azimuthal quantum number (l). l = 0, 1, 2, 3 correspond to s, p, d, f orbitals respectively, each with a distinct shape.
Interactive Concept Tool: Periodic Trend Direction Finder Q1.Among Na, Mg, Al, and Si (Period 3), which has the smallest atomic radius? Answer: (d) Si. Atomic radius decreases across a period from left to right due to increasing nuclear charge pulling electrons closer, so Si is the smallest of the four.
Q2.Ionization enthalpy generally increases across a period from left to right. This is mainly due to: Answer: (b) Increasing effective nuclear charge and decreasing atomic size. Electrons are held more tightly, requiring more energy to remove one.
Q3.Which of the following elements is the most electronegative? Answer: (a) Fluorine. Fluorine is the most electronegative element on the periodic table (Pauling scale value of 3.98).
Interactive Concept Tool: Molecular Shape (VSEPR) Finder Q1.What is the molecular shape of methane (CH₄)? Answer: (c) Tetrahedral. Carbon is sp³ hybridized with four bond pairs and no lone pairs, giving a bond angle of 109.5°.
Q2.A chemical bond formed by the mutual sharing of electrons between two atoms is called a: Answer: (b) Covalent bond. Ionic bonds, by contrast, form through the complete transfer of electrons between atoms.
Q3.According to VSEPR theory, the shape of a molecule is primarily determined by: Answer: (a) Minimizing repulsion between electron pairs around the central atom. Both bond pairs and lone pairs orient themselves as far apart as possible.
Interactive Concept Tool: Gibbs Free Energy (ΔG) Calculator Q1.For a process to be spontaneous at constant temperature and pressure, the Gibbs free energy change (ΔG) must be: Answer: (b) Negative. ΔG < 0 indicates a spontaneous process; ΔG = 0 indicates equilibrium; ΔG > 0 indicates a non-spontaneous process.
Q2.The First Law of Thermodynamics is fundamentally a statement of: Answer: (c) Conservation of energy. Energy can neither be created nor destroyed, only converted from one form to another (ΔU = q + w).
Q3.Which of the following is an extensive property (depends on the amount of substance)? Answer: (c) Internal Energy. Extensive properties scale with the quantity of matter present; temperature, density, and pressure are intensive properties.
Interactive Concept Tool: Le Chatelier's Principle Predictor Q1.For an exothermic reaction at equilibrium, increasing the temperature shifts the equilibrium: Answer: (b) Backward, toward reactants. Since heat is a product in an exothermic reaction, adding more heat (raising T) shifts equilibrium to counteract the change, favoring the reactants.
Q2.Adding a catalyst to a reaction already at equilibrium: Answer: (b) Does not shift the equilibrium position, only speeds up attainment. A catalyst speeds up both forward and reverse reactions equally, so equilibrium is reached faster but its position is unchanged.
Q3.What is the value of the ionic product of water (Kw) at 25°C? Answer: (a) 1 × 10-14. This gives [H⁺] = [OH⁻] = 1 × 10-7 mol/L in pure water at 25°C, corresponding to a neutral pH of 7.
Interactive Concept Tool: Oxidation Number Finder Q1.What is the oxidation number of manganese (Mn) in KMnO₄? Answer: (d) +7. K is +1 and each O is -2; solving +1 + x + 4(-2) = 0 gives x = +7 for Mn.
Q2.In a redox reaction, the substance that loses electrons and gets oxidized is called the: Answer: (b) Reducing agent. The reducing agent itself gets oxidized (loses electrons) while causing another species to be reduced.
Q3.A disproportionation reaction is one in which: Answer: (a) The same element in a species is simultaneously oxidized and reduced. Example: Cl₂ + 2OH⁻ → Cl⁻ + ClO⁻ + H₂O, where chlorine is both oxidized and reduced.
Interactive Concept Tool: Functional Group Identifier Q1.Which functional group is present in alcohols? Answer: (c) -OH (hydroxyl). The hydroxyl group attached to a saturated carbon defines an alcohol, e.g., ethanol (CH₃CH₂OH).
Q2.What is the IUPAC name of CH₃-CH₂-OH? Answer: (b) Ethanol. A two-carbon chain (eth-) with a hydroxyl group (-ol) gives ethanol.
Q3.Which purification technique separates organic compounds based on differences in their boiling points? Answer: (a) Distillation. Liquids with sufficiently different boiling points are separated by heating and selectively condensing vapors.
Interactive Concept Tool: Carbon Hybridization Finder Q1.What is the hybridization of the carbon atoms in ethyne (C₂H₂)? Answer: (c) sp. Each carbon in a triple bond is sp hybridized, forming a linear geometry with two sigma bonds and two pi bonds between the carbons.
Q2.What is the general formula for alkenes? Answer: (b) CnH2n. Alkanes follow CnH2n+2 and alkynes follow CnH2n-2, reflecting one and two degrees of unsaturation respectively less than alkenes.
Q3.According to Markovnikov's rule, when HBr adds to an unsymmetrical alkene, the hydrogen atom attaches to the carbon that: Answer: (a) Already has the greater number of hydrogen atoms. The Br then attaches to the more substituted carbon, forming the more stable carbocation intermediate.
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FAQs
You can start the latest Chemistry mock tests for Class 11 by selecting your chapter from the links above. These tests are free, dont need login and are optimized for the 2026-27 academic session.
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