NEET 2025 — Chemistry solution

NEET2025Chemistry

Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

Solution

Conductance in solution depends on the number of ions produced upon dissociation.

A. $[C o (N H_{3})_{3} C l_{3}]$

$[C o (N H_{3})_{3} C l_{3}]$ is a neutral complex. All the $C l^{-}$ ions are inside the coordination sphere, so it does not dissociate into ions.

Number of ions produced = $0$

B. $[C o (N H_{3})_{4} C l_{2}] C l$

$[C o (N H_{3})_{4} C l_{2}] C l \to [C o (N H_{3})_{4} C l_{2}]^{+} + C l^{-}$

Number of ions produced = $2$

C. $[C o (N H_{3})_{6}] C l_{3}$

$[C o (N H_{3})_{6}] C l_{3} \to [C o (N H_{3})_{6}]^{3 +} + 3 C l^{-}$

Number of ions produced = $4$

D. $[C o (N H_{3})_{5} C l] C l$

$[C o (N H_{3})_{5} C l] C l \to [C o (N H_{3})_{5} C l]^{+} + C l^{-}$

Number of ions produced = $2$

Since $[C o (N H_{3})_{3} C l_{3}]$ produces the least number of ions (zero), it has the minimum conductance in solution.

Answer: $[C o (N H_{3})_{3} C l_{3}]$

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