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Why are boron halides and diborane refer...

Why are boron halides and diborane referred to as 'electron deficient compounds' ?

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In these compounds, boron atom has an incomplete octet.
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ICSE-SOME P-BLOCK ELEMENTS -SHORT ANSWER TYPE QUESTIONS
  1. What happens when carbon dioxide is passed through lime water?

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  2. What is the role of CO2 in the synthesis of carbohydrates in plants?

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  3. Why are boron halides and diborane referred to as 'electron deficient ...

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  4. What happens when a borax solution is acidified ? Write a balanced equ...

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  5. Why do boron halides form addition compounds with ammonia ?

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  6. With the help of a balanced chemical equation, show that B(OH)3 behave...

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  7. Write the resonance structures of CO(3)^(2-)" and "HCO(3)^(-).

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  8. What is dry ice and why is it called so ?

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  9. Write the names and electronic configuration of all the elements belon...

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  10. Why is the atomic radius of gallium smaller than that of aluminium?

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  11. How do the Density property vary on moving down the group 13?

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  12. How do the Melting and boiling points property vary on moving down the...

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  13. How do the Metallic character property vary on moving down the group 1...

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  14. Why are the second and third ionisation energies of group 13 elements ...

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  15. What is inert-pair effect? Illustrate with an example.

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  16. Why does the stability of + 3 oxidation state decrease on moving down ...

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  17. Atomic size increases down a group of the periodic table. Explain.

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  18. Why does gallium have higher ionisation energy than aluminium?

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  19. Boron does not form ionic compounds containing B^(2+) ions. Comment on...

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  20. In the structure of diborane,

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