Surface of some metals loses their brightness when kept in air for a long time. Why?

Surface of some metals loses their brightness when kept in air for a long time. Why?

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

Salim Ahmed Kawsar

When certain metals like magnesium, aluminium, etc., are exposed to air, they form an oxide film on their surface. Thus, the surface lose its brightness when kept in air for a long time.

4 views Answered 2023-02-05 15:29

Related Questions

Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals

1 Answers 5 Views

Which of the following statements is correct? a. All metals are ductile. b. All non-metals are ductile. c. Generally, metals are ductile.

1 Answers 4 Views

Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.

1 Answers 6 Views

The one parameter that determines the brightness of a light source sensed by an eye is

1 Answers 5 Views

The brightness producing capacity of a source (a) does not depend on its power (b) does not depend on the wavelength emitted

1 Answers 4 Views

A 5.0 cm long straight piece of thread is kept on the surface of water. Find the force with which the surface on one side of the thread pulls it.

1 Answers 4 Views

A 5.0 cm long straight piece of thread is kept on the surface of water. Find the force with which the surface on one side of the thread pulls it.

1 Answers 5 Views

A piece of charcoal and a piece of shining steel of the same area are kept for a long time in an open lawn in bright sun.

1 Answers 8 Views

Consider the following statements: l. Albedo of an object determines its visual brightness when viewed with reflected light.

1 Answers 4 Views

A piece of iron of mass 100g is kept inside a furnace for a long time

1 Answers 5 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)