Skip to content / Đến nội dung
ThichHocToan.com

ASMO Science Olympiad 2015 — Level 2 (Years 5 & 6) Question 19

ASMO Science · ASMO Science Olympiad 2015 — Level 2 (Years 5 & 6)

Question 19

By comparing between iron (III) oxide and chromium (III) oxide, it is observed that chromium (III) oxide is much harder than iron (III) oxide. Why is that so?

Question illustration
  1. Chromium (III) oxide has a higher molecular weight.
  2. Chromium (III) oxide has stronger ionic bonds.
  3. Chromium (III) oxide layer is impermeable and non-porous.
  4. Chromium (III) oxide is waterproof material.