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📝 Class 10 Science – Mock Test Paper Chapter: Carbon and Its Compounds Maximum Marks: 30 Time: 1½ hours Section – A (1 × 5 = 5 marks) Write the molecular formula of propane . What is the functional group of alcohol? Name the product formed when ethanol is heated with excess concentrated H₂SO₄ at 443 K. State the reaction observed when acetic acid is added to NaHCO₃ solution. Write the structural formula of ethyne . Section – B (2 × 3 = 6 marks) Why does carbon form compounds mainly by covalent bonding? Differentiate between soaps and detergents . Write the reaction of saponification and name the products formed. Section – C (3 × 4 = 12 marks) Draw the electron dot structure of methane (CH₄) . State three characteristics of a homologous series with an example. Explain the mechanism of cleaning action of soap with the help of a labeled diagram. Write chemical equations for the following reactions: (i) Oxidation of ethanol (ii) Esterification of ethanol ...

📝 Class 10 Science – Pre-Board Mock Test Chapter: Carbon and Its Compounds Maximum Marks: 40 Time: 2 Hours Section – A (1 × 5 = 5 marks) Write the next homologue of butanol. State two uses of ethanol. Which property of carbon leads to the existence of a large number of organic compounds? Why do ionic compounds conduct electricity in aqueous solution but not in solid state? Write the molecular formula and structural formula of ethanoic acid. Section – B (2 × 5 = 10 marks) Differentiate between covalent and ionic compounds (any two points). Draw the electron dot structure of ethyne (C₂H₂). Define denatured alcohol . Why is ethanol denatured? Why are detergents more effective than soaps in hard water? Write chemical equations for: (i) Reaction of CH₃COOH with NaHCO₃ (ii) Oxidation of CH₃CH₂OH with acidified KMnO₄ Section – C (3 × 5 = 15 marks) Explain hydrogenation reaction . Write its equation and one industrial application. (a) Define homologous series. (...

Carbon and Its Compounds – Class 10 Important Questions Fill in the blanks An atom or a group of atoms that is responsible for the chemical characteristics of an organic compound is called ________. The general molecular formula of alkynes is ________. ________ compounds decolorize bromine water. Dehydration of ethanol by conc. H₂SO₄ forms ________. 100% pure ethanol is called ________. Ethanoic acid turns ________ litmus to ________. Multiple Choice Questions (MCQs) One mole of which of the following requires 2 moles of hydrogen to form a saturated hydrocarbon? a) Only P and Q b) Only R and S c) Only P and S d) Only P, Q and S Which of the following structures correctly represents the electron dot structure of a Nitrogen molecule? Assertion (A): Following are the structural isomers of butane. Reason (R): Structural isomers have the same molecular formula but they differ in structures. Choose the correct option: a) Both A and R are true and R is the correct ...

📝 Mock Test Paper – Chapter 1: Chemical Reactions and Equations Subject: Science (Chemistry) Class: 10 Board: CBSE Max Marks: 30 Time: 1½ Hours Section A – MCQs (1 × 5 = 5 Marks) Q1. Which of the following is an example of a decomposition reaction? a) CaO + H2O → Ca(OH)2 b) 2AgCl → 2Ag + Cl2 c) C + O2 → CO2 d) Zn + CuSO4 → ZnSO4 + Cu Q2. Which law is followed while balancing a chemical equation? a) Law of multiple proportion b) Law of conservation of mass c) Law of constant composition d) Law of definite proportion Q3. Identify the type of reaction: Zn + 2HCl → ZnCl2 + H2 Q4. In the reaction: 2Mg + O2 → 2MgO, magnesium is: a) Reduced b) Oxidized c) Neither oxidized nor reduced d) Displaced Q5. The brown gas evolved when lead nitrate crystals are heated is: a) CO2 b) NO2 c) SO2 d) O2 Section B – Short Answer Questions (2 × 5 = 10 Marks) Q6. Define a balanced chemical equation. Why should chemical equations be balanced? Q7. Write balanced c...

  Practice Questions – Chemical Reactions and Equations (Class 10, CBSE)(mock test -30) A. Multiple Choice Questions (MCQs) Which of the following is an endothermic reaction? a) Burning of coal b) Respiration c) Photosynthesis d) Condensation of steam Which law is followed while balancing chemical equations? a) Law of definite proportion b) Law of multiple proportion c) Law of conservation of mass d) Law of constant composition Which of the following is a double displacement reaction? a) Zn + H2SO4 → ZnSO4 + H2 b) 2H2O → 2H2 + O2 c) Na2SO4 + BaCl2 → BaSO4 + 2NaCl d) CH4 + 2O2 → CO2 + 2H2O Which of the following shows a chemical change? a) Melting of ice b) Burning of candle c) Dissolving sugar in water d) Breaking glass In the reaction: 2Mg + O2 → 2MgO Which substance is oxidized? B. Assertion-Reason Questions For each question, choose: (a) Both A and R are true, R is the correct explanation (b) Both A and R are true, but R is not the corr...

  Chemical Reactions and Equations – Class 10 Important Questions (Only Questions) Subject: Science (Chemistry) Class: 10 Board: CBSE Chapter No.: 1 Chapter Name: Chemical Reactions and Equations Session: 2025–26 Q. No. 1) Multiple Choice Questions (MCQs) i. Which of the following reaction(s) is an endothermic reaction? ii. You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______. iii. Which of the following are exothermic processes? iv. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is ______. v. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Which among the following is/are true about slaking of lime? vi. Identify the endothermic reaction(s) among the following: vii. Which of the following stat...