Suppressing ionisation by adding an ion already present is the:
AComplex ion effect
BConstant ion effect
CCommon ion effect
DCompound ion effect
Answer & Solution
Correct answer: C. Common ion effect
1. Adding a shared ion shifts the ionisation equilibrium.
2. This is called the common ion effect.
3. So the correct answer is common ion effect.
_Source: NCERT Class 11 Chemistry, Ch 7 'Equilibrium'_
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