MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions
The statement that is not correct is (KCET 2014)
A.hypophosphorus acid reduces silver nitrate to silver
B.in solid state PCl₅ exists as [PCl₄]+ [PCl₆]–
C.pure phosphine in non-inflammable✓ Correct
D.phosphorous acid on heating disproportionates to
Explanation
Pure phosphine gas is stable at normal temperature but on heating up to 150ºC, it catches fire and producers phosphorus pentoxide. 150 C 3 2 2 5 2 2PH 4O P O 3H O → P-BLOCK ELEMENTS (GROUP 15-18) 26