Acids, Bases and Salts
17 solved questions from Class 7 Science, each with the full working. Tap any question to see the step-by-step solution.
- 1 What is the fundamental scientific concept introduced in the chapter 'Acids, Bases and Salts'? medium MCQ Key Concept & Definition
- 2 Which of the following is an important application or observation related to 'Acids, Bases and Salts'? easy MCQ Practical Application
- 3 What primary question does the chapter 'Acids, Bases and Salts' aim to answer? medium MCQ Core Scientific Inquiry
- 4 Why is the study of 'Acids, Bases and Salts' essential for students in class-7? hard MCQ Importance & Significance
- 5 Which key practice is recommended while studying topics in 'Acids, Bases and Salts'? medium MCQ Scientific Method
- 6 What is the primary topic or theoretical principle explored in 'Acids, Bases and Salts' (Class 7 SCIENCE)? medium MCQ Chapter Core Principle
- 7 Which key mechanism or analytical rule is highlighted in 'Acids, Bases and Salts'? medium MCQ Key Analytical Mechanism
- 8 A 10 mL sample of 0.1 M hydrochloric acid is mixed with an equal volume of 0.1 M sodium hydroxide. Write the balanced chemical equation and determine the pH of the resulting solution. medium 2 marks Neutralisation reaction
- 9 A student prepares 200 mL of a 0.05 M solution of copper(II) sulfate by dissolving solid CuSO_4 in water. How many grams of CuSO_4 are required? hard 3 marks Preparation of solutions
- 10 In a neutralisation reaction, 25 mL of 0.2 M sulfuric acid reacts with excess sodium hydroxide. Find the volume (in mL) of 0.1 M NaOH required to completely neutralise the acid. hard 4 marks Stoichiometry of neutralisation
- 11 Calculate the pH of a 0.05 M solution of ammonia (NH₃). Given that the base dissociation constant Kb for NH₃ is 1.8×10^-5. hard 5 marks pH of weak base solution
- 12 During a titration, 25 mL of 0.03 M H₂SO₄ is titrated with 0.05 M NaOH using phenolphthalein as the indicator. Determine the volume of NaOH required to reach the endpoint. hard 3 marks Titration of diprotic acid
- 13 Which volume of 0.05 M NaOH is required to completely neutralise 30 mL of 0.1 M HCl? easy MCQ 2 marks Neutralisation stoichiometry
- 14 A 10 mL sample of 0.1 M HCl is mixed with 20 mL of 0.1 M NaOH. Write the balanced chemical equation and calculate the pH of the resulting solution. medium 2 marks pH calculation after mixing
- 15 A 0.02 M solution of hydrochloric acid is prepared. What is its pH? easy 1 mark pH of strong acid
- 16 In a laboratory, 90 mL of 0.05 M HCl is mixed with 120 mL of 0.03 M NaOH. Write the balanced chemical equation and calculate the pH of the resulting solution. hard 5 marks Stoichiometry & pH calculation
- 17 A student dissolves 0.3 g of sodium hydroxide (NaOH, molar mass 40 g mol⁻¹) in 300 mL of water. What is the molarity of the solution? easy 1 mark Molarity calculation