In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is:
In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is:
Option 1 -
Ionization enthalpy
Option 2 -
Electron gain enthalpy
Option 3 -
Atomic radius
Option 4 -
Electronegativity
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1 Answer
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Correct Option - 3
Detailed Solution:On moving Left to Right along a period.
Atomic Radius → decreases.
Electronegativity → Increases.
Electron gain enthalpy → Increases.
Ionisation Enthalpy → Increases
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Yield of 4-hydroxypentan-2-one is low because aldol and diacetone alcohol are also formed.
On moving left to right in a period.
Acidic character of oxides is increase.
3rd period element oxides.
(i) Acidic character 
(ii) Atomic No?
So 
have minimum Atomic No
&Z have maxima Atomic No
So correct order is
Ionization enthalpy: B < Be < O < N
IE of N > O [Due to half-filled configuration]
IE of Be > B [Due to penetration effect]
Species =CH4
Electrons =101010
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