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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 97

What change occurs in the weight of iron when it rusts?

  1. It first decreases and then increases
  2. It first increases and then decreases
  3. It remains the same
  4. It increases over a long time
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (D) It increases over a long time

Explanation

Rusting combines iron with oxygen and moisture, so the rusted object weighs more.

  • (A) Incorrect

    Wrong: it does not first decrease.

  • (B) Incorrect

    Wrong: it does not decrease (unless flakes fall off).

  • (C) Incorrect

    Wrong: oxygen and water are added.

  • (D) Correct

    Correct: rust (Fe₂O₃·xH₂O) adds oxygen and water, increasing weight.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.