Question

5. Gold jewellery does not become dull. Why?​

Answer 1

Answer:

because the humidity does not reacts on it

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Answer 2

Answer:

here is your answer☺

Explanation:

Gold jewellery are not made up of pure gold. The gold used in making the jewellery are alloy (mixture of gold, silver, copper). So in contact with atmospheric moisture and our body sweat the jewellery reacts and become tarnish.