5. Periodic Classification of Elements Class 10 Science [LATEST] Solutions Additional Questions With Solutions in English - CBSE Study
NCERT Solutions for Class 10 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 5. Periodic Classification of Elements with detailed explanations and step-by-step answers for better exam preparation. Each Additional Questions With Solutions is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 10 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 10 English Medium Science All Chapters:
5. Periodic Classification of Elements
4. Additional Questions With Solutions
Question 1 : Write the common name of CaO(s).
Answer: Limestone.
Question 2 : Why is sodium hydrogen carbonate a main ingredient of antacids?
Answer: Since sodium hydrogen carbonate is an alkaline substance it neutralizes acids.
Question 3 : In what physical states are the reactants and products represented in a chemical reaction?
Answer: In the form of solid (s), liquid (l), gas (g) and aqueous solution (aq).
Question 4 : What happens when a magnesium ribbon is lit in the presence of air?
Answer: It forms white colored magnesium oxide.
Question 5 : Why is respiration called an exothermic reaction? Give reason.
Answer: The process of respiration which takes place continuously in our cells is a type of exothermic reaction. After breaking down the carbohydrates obtained from food, it is converted into glucose, which together with oxygen in the respiration process gives us energy. Since energy is also released in exothermic reaction, therefore respiration is also called exothermic reaction.
Question 6 : Name the reaction in which two or more reactants combine to form a single product. Write a balanced equation for this reaction.
Answer: Combination reaction.
C + O2 - CO2
Question 7 : Which gas is used in the packing bag to keep the fatty or oily food material for a long time? Why ?
Answer: Oxygen is removed from the bag and made with nitrogen, this eliminates the possibility of oxidation and the substances kept in the bag do not discolor.
Question 8 : What properties do they get from the oxidation of fatty or oily food ingredients?
Answer: They become foul smelling.
Question 9 : Write two important measures to slow down the rate of oxidation of fatty or oily food ingredients.
Answer:
Keeping it in an airtight container speeds up the oxidation.
Removing oxygen from the pouch and containing it with nitrogen eliminates the possibility of oxidation.
Question: Name the reaction in which exchange of ions takes place between the reactants.
Question 10 : What is a chemical reaction called?
Answer: Such processes in which substances with new properties are formed are called chemical reactions.
For example, curd formation from milk, rusting of iron etc.
Question 11 : What are chemical equations called?
Answer: When a chemical reaction is expressed through symbols or formulas, it is called a chemical equation.
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