4. Materials : Metals And Non-Metals Class 8 Science [LATEST] Solutions Additional Questions With Solutions in English - CBSE Study
NCERT Solutions for Class 8 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 4. Materials : Metals And Non-Metals 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 8 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 8 English Medium Science All Chapters:
4. Materials : Metals And Non-Metals
5. Additional Questions With Solutions
Additional Questions With Solutions
Q14: Identify following oxides are metallic or non-metallic.
(i) An oxide turns red litmus into blue.
(ii) An oxide turns blue litmus into red.
Ans: (i) Metallic oxide. (ii) Non-metallic oxide.
Q15: Name the metal which reacts vigorously with water.
Ans: Sodium
Q16: Write the name of a non-metal which is a good conductor of electricity.
Ans: Graphite.
Q17: Define displacement reaction with example.
Ans: When a highly reactive metal react with a compound of it replaces the metal from compound such a reaction is called displacement reaction.
Example: CuSO4 + Fe ® FeSO4 + Cu ()
(Here Fe is a highly reactive metal and Cu is a less reactive metal)
Q18: Write three physical properties of metals.
Ans: Three physical properties of metals.
(i) Metals are ductile.
(ii) Metals are malleable.
(iii) Metals are sonorous.
Ques: Write the name of a metal which found liquid at room temperature.
Ans: mercury.
Q19: Name the metals which can be cut with knife.
Ans: Sodium and Potassium.
Q20: What happens when:
(i) Dilute sulphuric acid is poured on a copper plate?
Ans: when sulphuric acid is poured on copper plate copper sulphate is made and hydrogen gas is evolved as per the following chemical equation.
copper plate +sulphuric acid → copper sulphate + hydrogen.
(ii) Iron nails are placed in copper sulphate solution
Ans: When iron nails are placed in copper sulphate solution Cu is displaced by iron and colour of solution changes.
(iii) Write word equations of the reactions involved.
Ans: Chemical eqution is as follows;
Iron nails + sulphate → Iron sulphate + copper.
Q21. Give reasons for the following :
(i) Aluminium foils are used to wrap food items.
Ans: It maintains the temperature of food item intact as it is a good conductor of heat.
(ii) Immersion rods for heating liquids are made up of metallic substances.
Ans: Metals are good conductor of electricity. That is why immersion rods are made up of metals.
(iii) Copper cannot displace zinc from its salt solution.
Ans: It is because copper is less reactive than zinc.
(iv) Sodium and potassium are stored in kerosene.
Ans: It is because sodium and potassium reacts vigorously when come in contact with air or water.
Q22: Why is lemon pickle not stored in an aluminium utensil? Explain.
Ans: As lemon pickle contains acid which highly reactive to aluminium that resulting in destroyed of utensil.
Q23: Write the equation of rusting of iron.
Ans: 3Fe +2H2O + O2 → Fe3O4 + 2H2
Q24: What is the product formed, when sulphur reacts in air (O2)?
Ans: It is sulphur dioxide (SO2).
Q25: What is formed when sulphur dioxide is dissolved in water? Also write the eqution.
Ans: Sulphurous acid is formed.
So2 + H2O → H2SO3 (Sulphurous acid)
Q26: What is the reactivity of non – metals with water?
Ans: Non-metals do not react with water.
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