AIIMS 2018 Chemistry Reactions of Metals with Acids Assertion Reason Question

Option A is correct because both the assertion and reason accurately describe the reaction of metals with concentrated HNO₃. The assertion states that this reaction produces a metal nitrate, NO₂, and H₂O, which is true, as concentrated nitric acid oxidizes metals, yielding these products. The reason explains that nascent hydrogen is generated during the reaction, which then reduces HNO₃ to NO₂, correctly linking the processes involved.

Options B, C, and D are incorrect because they either misrepresent the relationship between the assertion and reason or incorrectly state that one or both are false. In reality, both statements are true and the reason provides a valid explanation for the assertion.