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Why oxide ion is called a hard ion?...

Why oxide ion is called a hard ion?

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Oxide ion `(O^(2-))` is very small in size and thus cannot be easily polarised and hence it is called a hard ion.
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CENGAGE CHEMISTRY-APPENDIX - INORGANIC VOLUME 1-Exercise Short
  1. Can marine species live in distilled water?

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  2. Give an example of (i) ionic hydride, (ii) covalent hydride.

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  3. Why oxide ion is called a hard ion?

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  4. How is D(2)O(2) prepared?

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  5. Complete the following: CaC(2)+2D(2)Oto?

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  6. 10 mL of a given solution of H(2)O(2) contains 0.91 g of H(2)O(2). Exp...

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  7. In some toothpastes hydrogen peroxide is used. What is the role of H(2...

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  8. What is Fenton's reagent?

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  9. What is perhydrol? Give its composition and use.

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  10. Explain why calcuim ion makes water hard, but sodium ion does not.

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  11. Name the alkali metals which do not combine directly with nitrogen.

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  12. What is the order of reactivity of alkali metals towards hydrogen?

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  13. Arrange the alkali metals in increasing order of their density.

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  14. Which among Na,K,Cs and Li forms most stable hydride?

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  15. Which among Li,Na,K and Cs has density greater than water?

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  16. Arrange K,Ca and Li in order of increasing electrode potential.

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  17. The ionisation enthalpy of Na is less than Ne. Why?

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  18. Arrange alkali metal fluorides and halides in the decreasing order of ...

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  19. Which among Na,Mg,Ba and Ca is the poor reducing agent?

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  20. Arrange alkali metal carbonate in increasing order of solubility.

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