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

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