Class 10 Science | MCQs & Answers Chapter 1: Chemical Reactions and Equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non-metals Chapter 4: Carbon and its Compounds Chapter 5: Periodic Classification of Eleme…
Activity 1.11 Heat a china dish containing about 1 g copper powder (Fig. 1.10). What do you observe? Answer: The surface of copper powder becomes coated with black copper(II) oxide. This is because oxygen is added to copper and…
Activity 1.10 Take about 3 mL of sodium sulphate solution in a test tube. In another test tube, take about 3 mL of barium chloride solution. Mix the two solutions (Fig. 1.9). What do you observe? Answer: A white substance (BaSO …
Activity 1.9 Take three iron nails and clean them by rubbing with sand paper. Take two test tubes marked as (A) and (B). In each test tube, take about 10 mL copper sulphate solution. Tie two iron nails with a thread and immerse …
Activity 1.8 Take about 2 g silver chloride in a china dish. What is its colour? (White). Place this china dish in sunlight for some time (Fig. 1.7). Observe the colour of the silver chloride after some time. Answer: Colour of S…
Activity 1.7 Take a plastic mug. Drill two holes at its base and fit rubber stoppers in these holes. Insert carbon electrodes in these rubber stoppers as shown in Fig. 1.6. Connect these electrodes to a 6 volt battery. Fill the …
Activity 1.6 . Take about 2 g lead nitrate powder in a boiling tube. Hold the boiling tube with a pair of tongs and heat it over a flame, as shown in Fig. 1.5. What do you observe? Note down the change, if any. Answer: Brown fum…
Activity 1.5 Take about 2 g ferrous sulphate crystals in a dry boiling tube. Note the colour of the ferrous sulphate crystals. (Colour is green). Heat the boiling tube over the flame of a burner or spirit lamp as shown in Fig. 1.…
Activity 1.4 Take a small amount of calcium oxide or quick lime in a beaker. Slowly add water to this. Touch the beaker as shown in Fig. 1.3. Do you feel any change in temperature? Answer: Beaker becomes hot. Calcium oxide react…
Activity 1.3 Take a few zinc granules in a conical flask or a test tube. Add dilute hydrochloric acid or sulphuric acid to this (Fig. 1.2). CAUTION: Handle the acid with care. ◾ Do you observe anything happening around the zinc…
Activity 1.2 Take lead nitrate solution in a test tube. Add potassium iodide solution to this. What do you observe? Answer: A yellow precipitate of lead iodide appears at the bottom. Activity 1.1 Activity 1.2 Activity 1.3 Acti…
Activity 1.1 CAUTION: This Activity needs the teacher’s assistance. It would be better if students wear suitable eyeglasses. Clean a magnesium ribbon about 3-4 cm long by rubbing it with sandpaper. Hold it with a pair of tongs. B…
Class 10 Science | Online Test Series Chapter 1: Chemical Reactions and Equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non-metals Chapter 4: Carbon and its Compounds Chapter 5: Periodic Classification of Elemen…
Class 10 Science | Exercise & Answers Chapter 1: Chemical Reactions and Equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non-metals Chapter 4: Carbon and its Compounds Chapter 5: Periodic Classification of E…
Class 10 Science | PPT in PDF Format Chapter 1: Chemical Reactions and Equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non-metals Chapter 4: Carbon and its Compounds Chapter 5: P…
Class 10 Science | PPT Presentations Chapter 1: Chemical Reactions and Equations Chapter 2: Acids, Bases and Salts Chapter 3: Metals and Non-metals Chapter 4: Carbon and its Compounds Chapter 5: P…
