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Q113) Phosphide ion has the electronic structure similar to that of .. [ CPMT 1988]




SOLUTION

Phosphitde ion is P3- have number of electrons 15+3 = 18
Cl- have 17+1 = 18 electrons
so P3- and Cl- are iso-electric
Answer: (d)


Q114) There is very little difference in acid strength in the series H3PO4, H3PO3 and H3PO2 because




SOLUTION

All given acids contains only one double bonded oxygen with P which is responsible for acidity due to inductive effect. there fore very less difference in acid strength
Answer: (b)


Q115) Constitution of superphosphate is .. [ COPMT1993]



SOLUTION

Supoer phosphate is Ca(H2PO4)2 + CaSO4 . 2H2O
Answer:(a)



Q116) In the P3-, S2- and Cl- ions the increasing order of size is ... [ AIIMS 1996]



SOLUTION

P3-, S2- and Cl- are isoelectronic species. their sizes increases as the nuclear charge decreases from Cl to P
Answer: (a)


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