IIT-JEE Exam

Which of the following complex species is not
expected to exhibit optical isomerism ?
(1) [Co(NH3)3Cl3] (2) [Co(en)(NH3)2Cl2]+
(3) [Co(en)3]3+ (4) [Co(en)2Cl2]+

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IIT-JEE Other Question

Which one of the following molecules is expected
to exhibit diamagnetic behaviour ?
(1) O2 (2) S2 (3) C2 (4) N2 Which of the following exists as covalent crystals
in the solid state ?
(1) Sulphur (2) Phosphorus
(3) Iodine (4) Silicon