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Q.

Amongst the following, select the element having highest ionisation enthalpy.

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a

Sodium

b

Potassium

c

Beryllium

d

Magnesium

answer is C.

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Detailed Solution

Ionisation enthalpy increases on moving from left to right in a period and decreases on moving down in a group. Thus, order of ionisation enthalpy is Be > Mg > Na > K.
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