Assertion: We should not keep gold in the air and moisture.
Reason: Gold will create a layer of substances that lowers its metallic lustre.

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The assertion is true, and the reason is false.

Both assertion and reason are false.

Both assertion and reason are true and the reason is the correct explanation of the assertion.

Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

answer is D.

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Detailed Solution

The assertion in the question is incorrect because gold is a highly non-reactive metal, which means it does not readily react with air or moisture. Therefore, it is incorrect to say that gold should not be kept in air and moisture. In fact, gold is often used in jewelry precisely because of its resistance to tarnishing and corrosion.

The reason given in the question is also incorrect because gold does not create a layer of substances that lowers its metallic lustre. However, it is possible for gold to develop a thin layer of oxide or other compounds on its surface if it comes into contact with certain chemicals or other reactive metals. This can affect its appearance, but it can usually be removed with simple cleaning methods.

In summary, both the assertion and reason are false.

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