Question

Colour of lead oxide when hot and cold?

Answer 1

The PbO can be changed from massicot to litharge or vice versa by controlled heating and cooling. The tetragonal form is usually red or orange color, while the orthorhombic is usually yellow or orange, but the color is not a very reliable indicator of the structure.

Answer 2

When the lead oxide is cool it is red or yellow in color and when it is heated it chages to yellow.

Explanation:

• Basically, the lead oxide is red or orange in its tetragonal form.
• But when it is heated or gets in orthorhombic form it forms either yellow or orange colour.
• Thus, The colour of the lead oxide before heating is red or orange and after heating its colour changes to yellow.
• This changed yellow colored oxide of lead is naturally unstable and as its temperature decreases it again changes into its original or stable colour or form which is red in colour.