What is the least soluble salt of the following set?
A) Ca(OH) 2 with Ksp = 4.7 × 10-6
B) Cd(OH) 2 with Ksp = 5.3 × 10-15
C) Fe(OH) 2 with Ksp = 4.9 × 10-17
D) Cr(OH) 2 with Ksp = 6.7 × 10-31
Correct Answer:
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