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Natural and Man-made Chemical Changes

Which of the ...

Question

Which of the following is known as philosopher's wool?

A

Boiling point

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B

Freezing point

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C

Bond energy

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D

Bond length

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Solution

The correct option is B Freezing point
When zinc is burned in the presence of oxygen, the zinc oxidises to form white fumes of zinc oxide which condenses to form a wool like solid called philosopher's wool.The chemical reaction is as follows:

$2 Z n + O_{2} \to 2 Z n O$

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