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Private Page This content is restricted. Please enter the password to continue. Unlock Content Incorrect password. Try again.   Answer Key Section A  Chemical reaction: A process in which one or more substances undergo a chemical change to form new substances with different properties. Observable sign: Change in colour / evolution of gas / change in temperature / formation of precipitate (any one). Balanced chemical equation: An equation in which the number of atoms of each element is the same on both sides. Combination reaction: A reaction in which two or more substances combine to form a single product. Example: CaO + H₂O → Ca(OH)₂ Type of reaction: Decomposition reaction. Corrosion: The gradual destruction of metals due to reaction with environment. Example: Rusting of iron. Chemical formula of rust: Fe₂O₃·xH₂O (hydrated iron(III) oxide) Rancidity: Oxidation of fats and oils lea...

Private Page This content is restricted. Please enter the password to continue. Unlock Content Incorrect password. Try again.   Test Paper 1  Chapter 1: Chemical Reactions and Equations Time: 1.5 Hours Maximum Marks: 30 Section A (1 × 8 = 8 marks) (Very Short Answer Questions) Attempt all questions. What is a chemical reaction? Write any one observable sign of a chemical reaction. What is meant by a balanced chemical equation? Define combination reaction with one example. What type of reaction is represented by: CaCO₃ → CaO + CO₂ What is corrosion? Give one example. Write the chemical formula of rust. What is rancidity? Section B (2 × 6 = 12 marks) (Short Answer Questions) Attempt all questions. Balance the following chemical equation: Fe + H₂O → Fe₃O₄ + H₂ Write the steps involved in balancing a chemical equation. Identify the type of reaction and justify: Zn + CuSO₄ → ZnSO...

A Triumph of Surgery Additional Questions Q1. How do you know that Mrs Phumphery was a rich lady? Q2. Why were the household dogs not interested in Tricki initially? Q3. Why was the narrator confident that Tricki will be in hospital soon? Q4. What was Mr Herriot’s strict advice? Did Mrs Phumphery follow his advice? Q5. What was the main cause of Tricki’s ill-health? Q6. The story shows the silly and negligent behaviour o rich people like Mrs Phumphery who may harm their near and dear ones by their extra caring nature. Tricki’s ill-health was the outcome of Mrs Phumphery’s over-caring nature. Do you think such people’s actions can prove to be fatal for the health of their kids? What advice would you suggest to such people to emulate in themselves and why? Write your answer in 1---120 words.   Q7. Read the following passage and answer the questions that follow. They were days of deep content, starting well with the extra egg in the morning, improved and sustained by...

Private Page This content is restricted. Please enter the password to continue. Unlock Content Incorrect password. Try again. Section A – Short Answer Questions (6 × 3 = 18 marks) 1. Who was Lencho? What was his main source of livelihood? Lencho was a poor farmer who lived in a small house on a hill with his family. His main source of livelihood was his corn field, which he depended on entirely for food and income. 2. Why was Lencho eagerly waiting for the rain? How did he feel when it began? Lencho was eagerly waiting for rain because his crops needed water to grow properly. When it began to rain, he felt very happy and satisfied, believing that his crops would have a good harvest. 3. What happened to the crops after the hailstorm? The hailstorm completely destroyed Lencho’s crops. The fields were covered with hailstones like salt, and not a single leaf remained on the trees. The entire corn crop was ruined, lea...