Class 10 Science - WEST-BENGAL
Metals and Non-metals
The Chapter 'Metals and Non-metals' in Class 10 Science under the WBBSE curriculum explores the physical and chemical properties of elements based on their metallic and non-metallic character. Students learn about reactivity series, the formation of ionic and covalent bonds, and electron dot structures. The chapter covers metallurgy, detailing how ores are extracted, concentrated, and refined through processes like roasting and calcination. It also focuses on corrosion prevention and alloy formation. This chapter is vital for the Madhyamik examinations as it forms the foundational base for inorganic chemistry, frequently featuring in conceptual reasoning and chemical equation-based questions.
Start Learning FreeKey Concepts
Physical Properties
Metals are generally solid, malleable, ductile, lustrous, and good conductors of heat and electricity, whereas non-metals lack these properties and are brittle.
Chemical Properties of Metals
Metals react with oxygen to form basic oxides, with water to form metal oxides or hydroxides and hydrogen gas, and with dilute acids to release hydrogen gas.
Reactivity Series
An arrangement of metals in decreasing order of their reactivities, used to predict whether a metal can displace another from its salt solution.
Ionic Compounds
Compounds formed by the complete transfer of valence electrons from a metal to a non-metal, resulting in high melting and boiling points.
Metallurgy
The step-by-step extraction of metals from their ores, involving concentration, conversion to oxides via roasting or calcination, and reduction to pure metal.
Important Formulas
Board Exam Info
In the West Bengal Board (WBBSE) Madhyamik examination, 'Metals and Non-metals' typically carries around 5 to 8 marks. Questions usually include multiple-choice questions (MCQs), very short answer type questions, reasoning-based questions on the reactivity series or corrosion, and balanced chemical equations.
Frequently Asked Questions
Why is sodium kept immersed in kerosene oil?
Sodium is a highly reactive metal that catches fire spontaneously when exposed to moisture and oxygen in the air. Kerosene cuts off contact with air and moisture, preventing accidental fires.
What is the difference between roasting and calcination?
Roasting is heating sulfide ores strongly in the presence of excess air, whereas calcination is heating carbonate ores strongly in the absence or limited supply of air.
Why do ionic compounds have high melting and boiling points?
Ionic compounds are made of oppositely charged ions held together by very strong electrostatic forces of attraction, requiring a large amount of thermal energy to break those bonds.
Learn Metals and Non-metals with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards