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CGP EDU Academic Team
Published on: August 13, 2026
Although it is a violent poison if swallowed, Mercury(II) cyanide Hg(CN) 2 , has been used as a typical skin antiseptic. (K sp of Hg(CN) 2 = 1.35 × 10 –23 , Atomic mass of Hg = 200 u). Assume no ion to be undergoing hydrolysis.
Text Solution
Verified by ExpertsThe correct answer is:
A
1.5 × 10 –8 M 3.78 × 10 –3 mg
3 × 10 8 mL
Sol. Hg (CN) 2 
Hg +2 + 2CN –
K sp = 4 s 3 = 1.35 × 10 –23 
s = 1.5 × 10 –8 M
Milligram of Hg(CN) 2 = [1.5 × 10 –8 ] × 252 × 10 3 = 3.78 × 10 –3 mg/L
3.78 × 10 –6 g dissolve in 1 L water,
∴ 1.134 gram dissolve in = 
L = 
L = 3 × 10 5 L = 3 × 10 8 mL
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