IIT-JEE Exam

The reaction of white phosphorous with aqueous NaOH gives phosphine along with another phosphorus
containing compound. The reaction type; the oxidation states of phosphorous in phosphine and the other
product are respectively
(A) redox reaction; – 3 and –5
(B) redox reaction ; 3 and + 5
(C) disproportionation reaction ; – 3 and + 5
(D) disproportionation reaction; – 3 and + 3

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IIT-JEE Other Question
NiCl2 {P (C2H5)2 (C6H5)}2 exhibits temperature dependentmagnetic behaviour (paramagnetic/ diamagnetic) .
the coordination geometries of Ni2+ in the paramagnetic and diamagnetic states are respectively
(A) tetrahedral and tetrahedral
(B) square planar and square planar
(C) tetrahedral and square planar
(D) square planar and tetrahedral In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are
option
(A) O2 and CO respectively
(B) O2 and Zn dust respectively
(C) HNO3 and Zn dust respectively.
(D) HNO3 and COrespectively