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In which of the following options, the order of arrangements does not agree with the variation of property indicated against it?
medium
Classification of Elements and Periodicity in Properties
2016
chemistry
A l 3 + < M g 2 + < N a + < F − Al^{3+} < Mg^{2+} < Na^+ < F^- A l 3 + < M g 2 + < N a + < F − (increasing ionic size)
B < C < N < O B < C < N < O B < C < N < O (increasing first ionization enthalpy)
I < B r < C l < F I < Br < Cl < F I < B r < Cl < F (increasing electron gain enthalpy)
L i < N a < K < R b Li < Na < K < Rb L i < N a < K < R b (increasing metallic radius)
Explanation To determine which option does not agree with the variation of the property indicated, we need to analyze each option separately. \\
Option 1: A l 3 + < M g 2 + < N a + < F − Al^{3+} < Mg^{2+} < Na^+ < F^- A l 3 + < M g 2 + < N a + < F −
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(increasing ionic size)
• Ionic size generally increases with decreasing positive charge and increasing negative charge.
•
has the smallest size due to the highest positive charge.
•
is smaller than
because of the higher positive charge.
•
is smaller than
because
has a negative charge.
• This order is correct.
Option 2:
B < C < N < O B < C < N < O B < C < N < O (increasing first ionization enthalpy)
• First ionization enthalpy generally increases across a period from left to right.
• However, nitrogen has a higher ionization enthalpy than oxygen due to its half-filled p orbital stability.
• The correct order should be
B < C < O < N . B < C < O < N. \\
B < C < O < N . • This order is incorrect.
Option 3:
I < B r < C l < F I < Br < Cl < F I < B r < Cl < F (increasing electron gain enthalpy)
• Electron gain enthalpy becomes more negative as we move up the group in halogens.
• Fluorine has less negative electron gain enthalpy than chlorine due to its small size and high electron-electron repulsion.
• The correct order is
I < B r < F < C l . I < Br < F < Cl. \\
I < B r < F < Cl . • This order is incorrect.
Option 4:
L i < N a < K < R b Li < Na < K < Rb L i < N a < K < R b (increasing metallic radius)
• Metallic radius increases down the group.
• This order is correct.
Therefore, the option that does not agree with the variation of property indicated is Option 2.