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Trend in Ionisation Enthalpy

Which represe...

Question

Which represents alkali metals based on $(I E_{1})$ and $(I E_{2})$ values?
$(I E)_{1}$ $(I E)_{2}$
(a) X 100 110
(b) Y 95 120
(c) Z 195 500
(d) M 200 250

X

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Y

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Z

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M

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Solution

The correct option is D $Z$
Alkali metals have a very high value of IE2 because of the octet formation when one electron is removed. Hence IE2 must be a lot higher than IE1.

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