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Q129) The three important oxidation states of phosphorus are .. [ Kerala MEE 2002]




SOLUTION

There important oxidation states of P are -3 in PH3, +3 in P2O3 and +5 in P2O5
Answer: (a)


Q130) Oxidation number of nitrogen is highest in .. [ j and K CEE 2003]




SOLUTION

Oxidation number of N in N3H is -1/3 which is lowest negative number
Answer: (a)


Q131) Ionic radii of As3+, Sb3+,and Bi3+ follow the order ... [ EAMCET 2001]



SOLUTION

Down the group ionic radii increases
Answer:(d)



Q132) In PO43- ion, the formal charge on each oxygen atom and P - O bond order respectively are ... [ CBSE PMT 1998]



SOLUTION

Four oxygen have total formal charge = -3
One oxygen have formal charge = -3/4 = -0.75
Total P - O bonds in PO43- ion = 5
Therefore , p - O bond order = 5/4 = 1.25
Answer: (a)


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