NextMockપરીક્ષાઓ શોધો, દા.ત. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · પ્રશ્ન 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
જવાબ બતાવો અને સમજૂતી

જવાબ: (D) It increases over a long time

સમજૂતી

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

  • (A) ખોટો

    Wrong: it does not first decrease.

  • (B) ખોટો

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

  • (C) ખોટો

    Wrong: oxygen and water are added.

  • (D) સાચો

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

  • (E) ખોટો

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