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What is the oxidation number of P in (H2...

What is the oxidation number of `P` in `(H_2 PO_4)^(1-)` ?

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SHARAM PUBLICATION-GROUP 15 ELEMENTS (NITROGEN FAMILY-EXERCISE
  1. What happens when (NH4)2 ,Cr2O7 is heated ?

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  2. Which allotrope of phosphorus is more reactive and why?

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  3. What is the oxidation number of P in (H2 PO4)^(1-) ?

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  4. Why is white phosphorus kept under water ?

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  5. Which gas is librated when NH4 NO2 is heated ?

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  6. Between nitrogen and phosphorus, which has more catenating property ?

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  7. Fill in the blanks : With excess of Cl2 ammonia forms …………

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  8. Nitrogen does not form pentahalides. Why?

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  9. Fill in the blanks : The formula of acidic nitrogen hydride is ………….

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  10. Fill in the blanks : The P- P-P angle in P4 molecule is …………..

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  11. Fill in the blanks : ……………. Is obtained when white phosphorus is heate...

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  12. Fill in the blanks : As2O3is …………….. While Sb2O3 is ………. .

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  13. Fill in the blanks : Red phosphorus is ………… reactive than white phosph...

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  14. Fill in the blanks : NH4 NO2 on heating gives ………… gas.

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  15. Fill in the blanks : …………… element of Gr - 15 is the most abundant in ...

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  16. Fill in the blanks : Aqueous solution of ammonia contains ……….. .

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  17. Fill in the blanks : The basicity of H3PO3 is …………

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  18. Fill in the blanks : The formula of pyrophosphorus acid is ………….

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  19. Fill in the blanks : In Brown ring test for NO3^(-) ion, Fe^2+ ion com...

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  20. Fill in the blanks : NH3 acts as a lewis base due to …………..

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