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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
Chapter

NEET 2026 · Chemistry · Chapter

If the overall stability constant ( β_2 ) for the formation of the...

If the overall stability constant (β2\beta_2) for the formation of the [Ag(CN)2]−\left[\mathrm{Ag}(\mathrm{CN})_2\right]^- complex is 5.0×10185.0 \times 10^{18}, determine the overall dissociation equilibrium constant (instability constant) for this complex ion.

Options

  1. A2.0×10−192.0 \times 10^{-19}
  2. B5.0×10−195.0 \times 10^{-19}
  3. C2.0×10182.0 \times 10^{18}
  4. D2.5×10−182.5 \times 10^{-18}

Correct answer

A. 2.0×10−192.0 \times 10^{-19}

Step-by-step solution

The overall dissociation equilibrium constant (instability constant) is the reciprocal of the overall stability constant (β2\beta_2).

Kd=1β2K_d = \dfrac{1}{\beta_2}

Substituting the given value:

Kd=15.0×1018K_d = \dfrac{1}{5.0 \times 10^{18}}

Kd=0.2×10−18K_d = 0.2 \times 10^{-18}

Kd=2.0×10−19K_d = 2.0 \times 10^{-19}

Answer: 2.0×10−192.0 \times 10^{-19}
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