📝 Solved Practice Sheet & MCQ Test
1. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.
Answer
- KCL(aq) + AgNO3(aq)--------> AgCl(s) + KNO3(aq)
- It is a double displacement reaction. It is also a precipitation reaction as AgCl is a white precipitate.
2. Write the balanced chemical equations for the following reactions.
- (a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen-carbonate.
- (b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.
- (c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu2I2), liberates iodine gas and also forms potassium sulphate.
Answer
3. Why do fireflies glow at night?.
Answer
- It is because protein present in fireflies undergoes oxidation in presence of air and an enzyme. This chemical reaction involves emission of visible light. Therefore, fireflies glow at night.
4. Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?.
Answer
- Grapes when attached to plants are living and therefore they have their immune system due to which they cannot get fermented. When microbes attack plucked grapes in absence of air, they undergo fermentation to form alcohol. This is a chemical process.
5. A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.
Answer
- The substance ‘X’ is calcium oxide (CaO), element is calcium. Calcium oxide is used in cement industry. Calcium is present in bones in form of calcium phosphate. Calcium oxide dissolves in water forming alkali which turns red litmus blue. CaO(s)
6. Why do we store silver chloride in dark coloured bottles?
Answer
- It is because silver chloride decomposes to silver and chlorine gas in presence of sunlight.
- 2AgCl(s) ----------------> 2Ag(s) + Cl2(g)
7. A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound
Answer
- Write the chemical formulae of X and Y.
- Write a balanced chemical equation, when X is dissolved in water.
- 2Mg(s) + O2(g) ------------> 2MgO(s) + light
- MgO(s) + H2O(l) ----------> Mg(OH)2(aq)
8.Which among the following changes are exothermic or endothermic in nature?
Answer
- Decomposition of ferrous sulphate
- Dilution of sulphuric acid
- Dissolution of sodium hydroxide in water
- It is exothermic process.
- It is exothermic process.
- It is endothermic process.
9.
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.
Answer
- Write a balanced chemical equation of the reaction involved
- What other name can be given to this precipitation reaction?
- On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
- BaCl2(aq) + Na2SO3(aq) --------> BasO3(s) + 2naCl
10.You are provided with two containers made up of (A) copper and (B) aluminium. You are also provided with solutions of (a) dilute HCl (b) dilute HNO3(c) ZnCl2 and (d) H20. In which of the above containers these solutions can be kept?
Answer
📖 Guide & Exam Strategy: Ncert Class 10 Science Chapter 1 Chemical Reactions Equations
Welcome to GKSchools comprehensive educational portal. This page is dedicated to Ncert Class 10 Science Chapter 1 Chemical Reactions Equations, a crucial segment under the CBSE Study Notes syllabus. Understanding Ncert Class 10 Science Chapter 1 Chemical Reactions Equations is essential for students and aspirants aiming to secure high ranks in competitive examinations. In this detailed study guide, we break down the core principles, solve practice questions, and share expert preparation strategies to help you gain mastery over this topic.
Why is this topic important? Questions on Ncert Class 10 Science Chapter 1 Chemical Reactions Equations are frequently asked in major exams like SSC CGL, UP Police Constable, Railway (RRB) NTPC, Bank PO, and State PSC Exams. Examiners test your logical understanding, speed, and accuracy in this segment. Scoring well here requires a combination of strong foundational concepts and regular practice. By studying the questions and solutions listed below, you can identify typical patterns and avoid common mistakes during the actual exam.
💡 Preparation Tips & Methods
Here are some valuable preparation tips for Ncert Class 10 Science Chapter 1 Chemical Reactions Equations:
- Clear Your Basics: Make sure you understand the foundational formulas or logical rules before jumping into mock tests.
- Daily Practice: Dedicate at least 20-30 minutes daily to solve different variations of Ncert Class 10 Science Chapter 1 Chemical Reactions Equations questions.
- Analyze Explanations: Do not just look at the correct option. Read the detailed step-by-step solutions to understand the logic.
- Time Management: Practice with a timer to build the speed required to solve reasoning and math queries efficiently.
🚀 Benefits of Regular Practice
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- 100% Free Practice Sets: Access premium mock tests and solved examples without any subscription.
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In conclusion, mastering Ncert Class 10 Science Chapter 1 Chemical Reactions Equations is a step-by-step journey that requires dedication. Use this study notes dashboard as your revision hub. Share this resource with your fellow aspirants, and bookmark the page for quick access before your exams. Let's begin the practice test below!
❓ Frequently Asked Questions (FAQs)
What is the best way to study Ncert Class 10 Science Chapter 1 Chemical Reactions Equations for competitive exams?
The best way is to learn the basic concepts, review step-by-step solved questions on GKSchools, and then attempt daily mock tests to build speed.
How many questions from Ncert Class 10 Science Chapter 1 Chemical Reactions Equations can we expect in the exam?
Typically, you can expect 3 to 5 questions from this topic in the Reasoning or Quantitative Aptitude section, depending on the specific exam.
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Does Ncert Class 10 Science Chapter 1 Chemical Reactions Equations require memorizing complex formulas?
Most questions test your logical reasoning and analytical abilities rather than complex formulas. However, practicing diverse patterns helps you recognize solutions faster.
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