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Q145) The oxyacid of phosphorus in which phosphorus has lowest oxidation state is ... [ EAMCET 1999]




SOLUTION

in Hypophosphrous acid ( H3PO2) contains P in +1 oxidation state
Answer: (a)


Q146) The oxidation number of As in H2AsO4- is ... [ CPMT 2001]




SOLUTION

2+ x -8 = -1
x = +5
Answer: (b)


Q147) Which of the following pentafluorides can not be formed? [ J and K CEE 2003]



SOLUTION

Due to inert pair effect in Bi +5 oxidation state is less stable than +3
Answer:(d)



Q148) Arrange the following in order of increasing acidity H3PO4 , H2CO3 , HCl, HI



SOLUTION


Answer: (c)


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