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Explain why calcuim ion makes water hard...

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

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Calcium forms an insoluble compound with stearate ion (soap anion), whereas sodium stearate is soluble.
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CENGAGE CHEMISTRY-APPENDIX - INORGANIC VOLUME 1-Exercise Short
  1. What is Fenton's reagent?

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

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

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

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

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

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

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

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

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

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

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

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

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  14. Arrange CaCO(3),KHCO(3) and NaHCO(3) in increasing order of solubiliti...

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  15. Why Be generally form covalent compounds?

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  16. Barium compounds are poisonous, even then BaSO(4) is used in barium me...

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  17. Which of the two cations Mg^(2+) and Al^(3+) is smaller?

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  18. Why alkaline earth metal oxides are quite stable?

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  19. Why solubility of sulphates decreases from BeSO(4) to BaSO(4)?

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  20. Why solubility of alkaline earth metal hydroxides increases from Be(OH...

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