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Question

Assertion: Aluminium foil cannot be used in the α - particle scattering experiment.
Reason: Aluminium is a highly malleable metal.

A
Both assertion and reason are correct and the reason is the correct explanation of the assertion.
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B
Both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
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C
The assertion is correct but the reason is incorrect.
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D
The assertion is incorrect but the reason is correct.
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Solution

The correct option is B Both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
Both the assertion and the reason are correct statements. An element which is extremely malleable was required for this experiment to work.

Since gold is the most malleable metal, it was used in the particle scattering experiment. A very, very thin sheet of gold which is just around 1000 atoms thick (thin?) was used in this experiment. That's about 100 times thinner than a human hair!

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