Acids, Bases and salts-science class 10th test

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Acids, Bases and salts-science class 10th test

 

Based on the latest CBSE syllabus for the 2024-25 academic year, here is a comprehensive test paper for Class 10 Science Chapter 2: “Acids, Bases, and Salts.” This test is designed to assess in-depth knowledge, competency, and familiarity with previous examination trends.

classtale test papers

Section A: In-Depth Knowledge Questions

  1. Explain the chemical process involved in the chlor-alkali industry. What are the products obtained, and list two uses for each?
  2. Describe the pH scale. How does the pH value of a solution determine its acidic or basic nature? Provide examples of substances with varying pH values and discuss their practical applications.
  3. Discuss the role of acids and bases in our daily lives, including their uses in household products, industry, and biological systems. Provide specific examples to illustrate their significance.

Section B: Competency-Based Questions

  1. A student added a few drops of universal indicator to a solution and observed a green color. What does this indicate about the solution’s pH? Suggest a possible substance that could result in this observation and justify your answer.
  2. During a laboratory experiment, a gas was evolved when dilute hydrochloric acid reacted with zinc granules. The gas was collected and tested with a burning splint, producing a ‘pop’ sound. Identify the gas and write the balanced chemical equation for the reaction. Explain the test used to identify the gas.
  3. A farmer finds that the soil in his field is too acidic for crop growth. What compound should he add to the soil to neutralize its acidity? Explain the chemical reaction that occurs in the soil upon adding this compound.

Section C: Previous Year Questions

  1. What is observed when carbon dioxide gas is passed through lime water:
    • (i) For a short duration?
    • (ii) For a long duration?

Also, write the chemical equations for the reactions involved.

  1. Explain the reaction between an acid and a metal carbonate with the help of a balanced chemical equation. What are the products formed in this reaction?
  2. Define a neutralization reaction. Give two examples from everyday life where neutralization reactions are applied.

Section D: NCERT Textbook Questions

  1. (a) Identify the acid and the base whose combination forms the common salt used in your food. Write its chemical formula and name.

(b) What is rock salt? Mention its color and explain the reason for this color.

(c) What happens when electricity is passed through brine? Write the chemical equation for the process.

  1. Explain the process of obtaining plaster of Paris from gypsum. Write the chemical equation involved and mention one important use of plaster of Paris.

Section E: Sample Paper Questions

  1. How will you test for a gas which is liberated when hydrochloric acid reacts with an active metal? Describe the procedure and the observation.
  2. What is baking powder? How does it make the cake soft and spongy? Explain the chemical reaction involved during the baking process.
  3. When fresh milk is changed into curd, will its pH value increase or decrease? Explain the reason behind this change.

Section F: Case-Based Questions

  1. Case Study: Industrial Production of Sodium Hydroxide

Sodium hydroxide is produced industrially through the chlor-alkali process.

(a) Describe the chlor-alkali process with the help of a labeled diagram.

(b) List the products obtained from this process and mention one use of each.

(c) Explain why this process is called the chlor-alkali process.

  1. Case Study: Environmental Impact of Acid Rain

Acid rain is a significant environmental issue caused by the release of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) into the atmosphere.

(a) Explain how acid rain is formed, including the chemical reactions involved.

(b) Discuss the effects of acid rain on aquatic life and plant vegetation.

(c) Suggest two measures to reduce the occurrence of acid rain.

Note: This test paper is designed to comprehensively assess students’ understanding of Chapter 2: “Acids, Bases, and Salts” in the Class 10 Science curriculum, aligning with the latest CBSE syllabus and examination patterns.

 

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