Take a strip of aluminium foil and dip it in dilute hydrochloric acid solution. Do you see bubbles rising in the solution? What do the bubbles contain?

When a strip of aluminium foil is dipped in a dilute hydrochloric acid solution, it reacts with the hydrochloric acid solution, causing gas bubbles to rise in the solution. When a strip of aluminium foil is dipped in a dilute hydrochloric acid solution, the aluminium displaces hydrogen from the hydrochloric acid, forming an aluminium chloride salt along with the liberation of hydrogen gas. This is due to the fact that aluminium is more reactive than hydrogen. The bubbles that form are hydrogen gas bubbles.

Slow destruction of metals due to chemical reactions on their surface by oxygen, carbon dioxide, moisture, sulphur dioxide, hydrogen sulphide, etc., present in the atmosphere, is known as corrosion.

The elements which are brittle, non-lustrous, non-malleable, non-ductile and poor conductors of heat and electricity are called non-metals. Non-metals are dull in appearance.

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GALAXY SCIENCE IN EVERYDAY LIFE>Chapter 4 - Metals and Non-metals>ORAL QUESTIONS

Subject Experts Solutions for Chapter: Metals and Non-metals, Exercise 1: Activity Questions

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Subject Experts Science Solutions for Exercise - Subject Experts Solutions for Chapter: Metals and Non-metals, Exercise 1: Activity Questions

Attempt the practice questions on Chapter 4: Metals and Non-metals, Exercise 1: Activity Questions with hints and solutions to strengthen your understanding. GALAXY SCIENCE IN EVERYDAY LIFE solutions are prepared by Experienced Embibe Experts.

Questions from Subject Experts Solutions for Chapter: Metals and Non-metals, Exercise 1: Activity Questions with Hints & Solutions

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GALAXY SCIENCE IN EVERYDAY LIFE>Chapter 4 - Metals and Non-metals>Activity Questions>Q 1

Rub a piece of lime on the dull surface of a metal object. Keep it for some time. Wash off the lime. Then take a piece of cloth and polish the surface until the metal shines.

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1. Does the metal regain its lustre?
2. Does lime contain acid?
3. Does an acid react with a metal oxide?