Separation of Substances

15 solved questions from Class 6 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 'Separation of Substances'? medium MCQ Key Concept & Definition
• 2 Which of the following is an important application or observation related to 'Separation of Substances'? easy MCQ Practical Application
• 3 What primary question does the chapter 'Separation of Substances' aim to answer? medium MCQ Core Scientific Inquiry
• 4 Why is the study of 'Separation of Substances' essential for students in class-6? hard MCQ Importance & Significance
• 5 Which key practice is recommended while studying topics in 'Separation of Substances'? medium MCQ Scientific Method
• 6 What is the primary topic or theoretical principle explored in 'Separation of Substances' (Class 6 SCIENCE)? medium MCQ Chapter Core Principle
• 7 Which key mechanism or analytical rule is highlighted in 'Separation of Substances'? medium MCQ Key Analytical Mechanism
• 8 An experiment requires separating ethanol from a 250 mL solution that contains 30 % ethanol by volume. Simple distillation is used, and the first distillate is collected at 78 °C, which contains pure ethanol. If 60 mL of distillate is collected, what volume of ethanol was recovered, and what percentage of the ethanol present in the original solution has been recovered? Assume 100 % collection efficiency. hard 5 marks Distillation
• 9 In a paper chromatography experiment, the solvent front moves 12 cm from the base line. A blue dye spot travels 8 cm from the base line. What is the Rf value of the blue dye? medium 3 marks Paper chromatography
• 10 During a science experiment, a student mixes 50 g of fine sand with 200 mL of tap water and pours the mixture through filter paper in a funnel. Which process is used to separate the sand from the water? easy 2 marks Filtration
• 11 A student has 200 mL of a sodium chloride solution. After heating, all the water evaporates and 15 g of sodium chloride remains. What is the concentration of the solution in grams per litre? medium 2 marks Concentration (mass/volume) calculation
• 12 A student mixes 40 g of fine iron filings with 250 mL of tap water and passes the mixture through filter paper placed in a funnel. Which process is used to separate the iron filings from the water? easy MCQ 1 mark Solid–liquid separation using a filter
• 13 Why is the process of evaporation useful for separating a solid from a liquid mixture? medium 2 marks Solid–liquid separation by phase change
• 14 Which process is used to separate iron filings from water when a funnel with filter paper is used? easy MCQ 2 marks Filtration separates solid from liquid
• 15 In a paper chromatography experiment, a red dye spot is placed 1 cm from the baseline. The solvent front travels 10 cm. The red dye moves 6 cm. What is the Rf value? If the solvent front now travels 12 cm while the dye spot remains at 6 cm, what is the new Rf? hard 5 marks Paper chromatography Rf calculation