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Why BF6^(3-) does not exist, explain....

Why `BF_6^(3-)` does not exist, explain.

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UNITED BOOK HOUSE-MODEL QUESTION PAPER 19-EXERCISE
  1. State two postulates of Bohr atom model

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  2. Slate with equation effect of temperature on Boric Acid.

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  3. Why BF6^(3-) does not exist, explain.

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  4. Which one is weak acid and why?ICH2 COOH, BrCH2 COOH,ClCH2COOH.

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  5. Which is most basic and why?CH3NH2, (CH3)2 NH, (CH3)3 N

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  6. What is particulate mater? Give two example'

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  7. Write two defects.of Bohr atom model. Concept of which quantum number ...

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  8. Derive the equation for radius of n th shell form Bohr theory.

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  9. What is d-block element? Give two example

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  10. Why the S-block element does not respond to flame test? State two prop...

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  11. State reason:- Bond angle of PF3 is greater than NH3

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  12. State reason:-CO2 is linear but not SO2

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  13. Write two differences between sigma&pi bond. What is antibonding mole...

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  14. State Daltons partial pressure laws and derive partial pressure and to...

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  15. Calculate the partial pressure of SO2 in a mixture with 60% CO2 and to...

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  16. What,do you mean by enthalpy of a system? Write two characteristic of ...

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  17. Calculate, DeltaU, W and Q when an ideal gas is compressed at 5 atm...

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  18. Balance the equation by oxydation no. method :-AL+ NaOH + H2O rarr NaA...

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  19. Balance by ion electron method : Zn + NaNO3 rarr Na2ZnO2 + NH3 + H2O

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  20. Balance the equation by oxydation no. method :- Na2S2O3 +I2rarr Na2S4O...

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