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Periodic Classification of Elements — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
Assertion (A): When iron is dipped in conc. $HNO _3$ it becomes chemically inert (or) passive.
Reason (R): Iron becomes passive when treated with nitric acid is due to the formation of a layer of iron oxide $Fe _3 O _4$ on its surface.
  • A
    Both (A) and (R) are correct
  • B
    (A) is correct but (R) is wrong
  • C
    (A) is wrong but (R) is correct
  • ✓
    Both (A) and (R) are wrong.
✓

Answer

Correct option: D.
Both (A) and (R) are wrong.
(d) Both (A) and (R) are wrong

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