IIT-JEE 2007 · Paper 1 · Chemistry Q42

ChemistryMatrix match+6Question 42 of 66

Match the complexes in Column I with their properties listed in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.

Column I

A
$\ce{[Co(NH3)4(H2O)2]Cl2}$
B
$\ce{[Pt(NH3)2Cl2]}$
C
$\ce{[Co(H2O)5Cl]Cl}$
D
$\ce{[Ni(H2O)6]Cl2}$

Column II

P
geometrical isomers
Q
paramagnetic
R
diamagnetic
S
metal ion with +2 oxidation state

Answer and worked solution

Official answer: A → P, Q, S; B → P, R, S; C → Q, S; D → Q, S

A, $\ce{[Co(NH3)4(H2O)2]Cl2}$ : Co(+2), d⁷, unpaired electrons (paramagnetic); $\ce{MA4B2}$ octahedral, cis/trans isomers. → P, Q, S.
B, $\ce{[Pt(NH3)2Cl2]}$ : Pt(+2), d⁸ square planar, diamagnetic; cis/trans isomers. → P, R, S.
C, $\ce{[Co(H2O)5Cl]Cl}$ : Co(+2), paramagnetic; $\ce{MA5B}$ has no geometrical isomers. → Q, S.
D, $\ce{[Ni(H2O)6]Cl2}$ : Ni(+2), d⁸ octahedral, two unpaired electrons; no isomers. → Q, S.

Answer: A → P, Q, S; B → P, R, S; C → Q, S; D → Q, S

Topics:Isomerism in complexes Magnetic properties and colour Crystal field theory

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IIT-JEE 2007 · Paper 1, Chemistry question 42