Class 10 Science - HARYANA

Metals and Non-metals

The Class 10 Science chapter 'Metals and Non-metals' explores the physical and chemical properties of elements, helping Haryana Board (BSEH) students understand how metals react with oxygen, water, and acids. You will learn about reactivity series, ionic bonding, the formation of ionic compounds, and metallurgy—the extraction of ores from the earth. This chapter holds high weightage in the BSEH board exams, frequently featuring direct chemical equations, reasoning questions about reactivity, and practical applications of corrosion prevention like galvanization, making it essential for scoring high marks.

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Key Concepts

Physical Properties

Metals are generally solid, malleable, ductile, sonorous, 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 oxides or hydroxides and hydrogen gas, and with dilute acids to produce salt and hydrogen.

Reactivity Series

An arrangement of metals 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 conductivity in molten or aqueous states.

Metallurgy and Corrosion

The process of extracting metals from ores involving concentration, reduction, and refining, alongside methods to prevent corrosion like painting, oiling, and galvanization.

Important Formulas

Metal + Oxygen -> Metal Oxide (e.g., 2Mg + O2 -> 2MgO)
Metal + Water -> Metal Oxide/Hydroxide + Hydrogen
Metal + Dilute Acid -> Salt + Hydrogen
General Ionic Compound Formation: Metal (losing e-) + Non-metal (gaining e-) -> Ionic Bond

Board Exam Info

In the Haryana Board (BSEH) Class 10 Science exam, this chapter typically carries around 4 to 6 marks. Common question types include chemical equations for reactions of metals with water and acids, displacement reactions based on the reactivity series, and conceptual reasoning questions about ionic bonding or the prevention of corrosion.

Frequently Asked Questions

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

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

What is the reactivity series and how is it useful?

The reactivity series is a list of metals arranged in order of their decreasing reactivity. It helps us predict displacement reactions and understand how different metals react with water, acids, and oxygen.

Why does hydrogen gas not evolve when a metal reacts with nitric acid?

Nitric acid is a strong oxidizing agent. When it reacts with a metal, it oxidizes the produced hydrogen to water and gets reduced itself to nitrogen oxides (like N2O, NO, or NO2).

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