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Q33) Which acid has P - P linkage? [AFMC 2009]



SOLUTION
Structures are as follows
Pyrophosphoric acid Metaphosphoric acid Orthophosphoric acid Hypophosphoric acid
From above it is clear P-P bond exists only in Hypophosphoric acid

Answer: (a)


Q34) Which of the following element occurs free in nature? [ CPMT 1988]



SOLUTION


Answer: (a)


Q35)Which of the following element shows oxidation state + 1 to + 5 in its oxide? [2010]



SOLUTION

Possible oxidation states for F is -1
For As is +5,-3
For P is +5 and 3
For N is 1 to +5
Answer: (a)



Q36) PbO2 on reaction with cone. HNO3 gives [2010]



SOLUTION

complete reaction is PbO2 + HNO3 → Pb(NO3)2 + H2O + ½(O2)
Answer: (b)


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