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Chemical Properties of Boron Family

Assetion A: ...

Question

Assetion (A): $A l$ shows passivity with conc. $H N O_{3}$
Reason (R): $A l$ forms a protective layer of $A l_{2} O_{3}$ with conc. $H N O_{3}$

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Assertion is false but Reason is true

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
A passive layer of aluminium oxide is formed on the aluminium metal by the reaction of Aluminium with concentrated Nitric Acid
$2 A l + 6 H N O_{3} c o n c . \to A l_{2} O_{3} + 6 N O_{2} + 3 H_{2} O$

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