IIT-JEE Exam

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

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IIT-JEE Other Question
Two spherical planets P andQ have the same unfirom density ,massesMP andMQ, an surface areas A and 4A, respectively. A spherical planet R also has unfirom density and its mass is (MP + MQ) . The escape velocities from the planets P, Q and R, are VP, VQ and V respectivley. Then
option
(A) VQ > VR > VP
(B) VR > VQ > VP
(C) VR/VP = 3
(D) VP /VQ =1/2 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