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Why is K(2)Cr(2)O7 generally preferred o...

Why is `K_(2)Cr_(2)O_7` generally preferred over `Na_(2)Cr_(2)O_(7)` , in volumetric analysis though both are oxidising agents ?

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`Na_(2)Cr_(2)O_7` absorbs moisture from the atmosphere.
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KALYANI PUBLICATION-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Why is KMnO4 kept in dark bottles ?

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  2. Why is HCl not used to acidify a permanganate solution in volumetric e...

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  3. Why is K(2)Cr(2)O7 generally preferred over Na(2)Cr(2)O(7) , in volume...

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  4. What happens when chromates are kept in acidic solution and dichromate...

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  5. In permanganate ion, all the bonds formed between Mn and oxygen are co...

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  6. Why lanthanoids and actinoids are called f-block elements?

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  7. State the common characteristic of lanthanoids and actanoids which pla...

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  8. Give the general electronic configuration of actinoids

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  9. The size of the trivalent cations in the lanthanoid series decreases s...

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  10. Out of the following identify (i) the *d' block element (ii) the of bl...

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  11. State a consequence of lanthanoid contraction shown by transition elem...

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  12. Write outer electronic configuration of lanthanoids.

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  13. Which trivalent cation is largest in lanthanoid series ?

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  14. Write any two uses of pyrophoric alloys.

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  15. Write are non-stoichimetric oxides ? Give one example.

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  16. Give one use each of (i) niobium (ii) tantalum.

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  17. Give two properties in which interstitial compounds differ from its el...

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  18. Why is copper-29 considered a transition metal?

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  19. Why do Zr and Hf exhibit similar properties?

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  20. What is lanthanoid contraction ?

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