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Question
The least basic hydroxide from the following is:
Options
Pr(OH)3 (Z = 59)
Sm(OH)3 (Z = 62)
Ho(OH)3 (Z = 67)
La(OH)3 (Z = 57)
MCQ
Solution
Ho(OH)3 (Z = 67)
Explanation:
Since the ionic size decreases from La3+ to Lu3+, the basicity of hydroxides decreases in the following order:
La(OH)3 > Pr(OH)3 > Sm(OH)3 > Ho(OH)3
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The pH Scale
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