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Class 10th Ch-1 Cheamical Reaction and Equation (by Manish Sharma) I n-text questions set 1 Page number – 6 1. Why should a magnesium ribbon be cleaned before burning in air? Solution: Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide (MgO) layer which is a very stable compound. In order to prevent further reactions with Oxygen, it is therefore necessary to clean the ribbon by to remove the layer of MgO. 2. Write a balanced equation for the following chemical reactions. i) Hydrogen + Chloride —-> Hydrogen chloride ii) Barium chloride + Aluminium sulphate —-> Barium sulphate + Aluminium chloride iii) Sodium + Water —-> Sodium hydroxide + Hydrogen Solution: i) H 2  + Cl 2  → 2HCl ii) 3BaCl 2  + Al 2 (SO 4 ) 3  →3BaSO 4  + 2AlCl 3  iii) 2Na + 2H 2 O → 2NaOH + H 2 3. Write a balanced chemical equation with state symbols for the following reac...

Class 10th Ch-12 Electricity (by Manish Sharma) Question:1 What does an electric circuit mean? Solution: An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires. Question:2 Define the unit of current. Solution: The unit of electric current is ampere (A). 1 A is defined as the flow of 1 C of charge through a wire in 1 s. Question:3 Calculate the number of electrons constituting one coulomb of charge. Solution: One electron possesses a charge of 1.6 × 10−19 C, i.e., 1.6 × 10−19 C of charge is contained in 1 electron. ∴ 1 C of charge is contained in Therefore, electrons constitute one coulomb of charge. Question:4 Name a device that helps to maintain a potential difference across a conductor. Solution: A source of electricity such as cell, battery, power supply, etc. helps to maintain a potential difference across a conductor. Question:5 What is meant by saying that the potential difference between two points ...