Class 10 Science - GUJARAT

Metals and Non-metals

The GSEB Class 10 Science chapter 'Metals and Non-metals' explores the physical and chemical properties of elements based on their metallic character. Students learn about reactivity series, ionic and covalent bonding, formation of minerals and ores, and metallurgy processes like roasting and calcination. This chapter is vital for the Gujarat Board exams as it frequently features conceptual reasoning questions, chemical equation balancing, and distinctions between metal and non-metal behaviors, making it a high-scoring section if core concepts are clear.

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Key Concepts

Physical Properties

Metals are generally solid, malleable, ductile, lustrous, and good conductors of heat and electricity, whereas non-metals lack these properties and can be solids, liquids, or gases.

Chemical Properties of Metals

Metals react with oxygen to form basic oxides, with water to form metal hydroxides or oxides and hydrogen gas, and with dilute acids to release hydrogen gas.

Reactivity Series

A list of metals arranged in order of decreasing reactivity, which helps predict whether a more reactive metal can displace a less reactive metal from its salt solution.

Ionic Compounds

Compounds formed by the transfer of electrons from a metal to a non-metal, resulting in high melting and boiling points and good conductivity in molten or aqueous states.

Metallurgy and Corrosion

The extraction of metals from their ores through concentration, reduction, and refining, alongside methods like galvanizing and alloying to prevent corrosion like rusting.

Important Formulas

Metal + Oxygen -> Metal Oxide
Metal + Water -> Metal Oxide/Hydroxide + Hydrogen
Metal + Dilute Acid -> Salt + Hydrogen
Fe + CuSO4 -> FeSO4 + Cu

Board Exam Info

In the Gujarat (GSEB) Class 10 Science board exam, this chapter typically carries around 5 to 7 marks. Questions frequently include 1-mark objective questions, 2-mark reasoning questions about reactivity or corrosion, and 3-mark descriptive questions on metallurgy processes or ionic bonding.

Frequently Asked Questions

Why do ionic compounds have high melting and boiling points?

Ionic compounds have high melting and boiling points because there is a strong electrostatic force of attraction between the oppositely charged ions, which requires a large amount of energy to break.

What is the difference between roasting and calcination?

Roasting involves heating a sulfide ore strongly in the presence of excess air, while calcination involves heating a carbonate ore strongly in the absence or limited supply of air.

Why is sodium stored under kerosene?

Sodium is a very reactive metal that reacts vigorously with oxygen and moisture in the air and can catch fire, so it is kept immersed in kerosene to prevent accidental exposure.

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