(A) : BeO and Al₂O₃ are amphoteric.
(R) : Be and Al are made passive by HNO₃.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is B.

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Detailed Solution

BeO and Al₂O₃ are amphoteric in nature.

The oxides of both Be [BeO] and Al[Al₂O₃] are amphoteric and hence they dissolve in NaOH solution as well as in HCl
BeO + 2HCl → BeCl₂ + H₂O

large BeO; + ;2NaOH; to ;mathop {N{a_2}Be{O_2}}limits_{Sod.Berrylate} ; + ;{H_2}O

Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O
${Al}_{2} O_{3} + 2 NaOH \to 2 {NaAlO}_{2} + H_{2} O$

Be and Al become passive (resistant) on reaction with concentrated nitric acid due to formation of protective oxide layer on the surface of the Be and Al metals.

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