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Question

Increasing basic properties of TiO2,ZrO2 and HfO2 are in order:
  1. TiO2<ZrO2<HfO2
  2. HfO2<ZrO2<TiO2
  3. HfO2<TiO2<ZrO2
  4. ZrO2<TiO2<HfO2

A
HfO2<ZrO2<TiO2
B
HfO2<TiO2<ZrO2
C
TiO2<ZrO2<HfO2
D
ZrO2<TiO2<HfO2
Solution
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The basic properties of the oxides increases with atomic number: TiO2 is amphoteric, and ZnO2 , HfO2 are increasingly basic.

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