Which of the following statements is incorrec | vedclass

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(D) $1$. Ionization enthalpy decreases down a group. Thus,for alkali metals: $Li > Na > K$. Statement $A$ is correct.$2$. In noble gases,ionization en

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The first ionization enthalpy of $Ga$ is higher than that of the $d-$block element with atomic number $30$.

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(D) $1$. Ionization enthalpy decreases down a group. Thus,for alkali metals: $Li > Na > K$. Statement $A$ is correct.$2$. In noble gases,ionization enthalpy decreases down the group. $Xe$ is below $He, Ne, Ar, Kr$,so it has a lower ionization enthalpy than them. However,$Rn$ is below $Xe$,so $Rn$ has the lowest. Thus,$Xe$ is not the lowest. Statement $B$ is correct.$3$. Atomic number $37$ is $Rb$ (Group $1$) and atomic number $38$ is $Sr$ (Group $2$). Across a period,ionization enthalpy increases. Thus,$Sr > Rb$. Statement $C$ is correct.$4$. Atomic number $30$ is $Zn$ $([Ar] 3d^{10} 4s^2)$ and $Ga$ is $([Ar] 3d^{10} 4s^2 4p^1)$. Due to the stable $d^{10}$ configuration and higher effective nuclear charge,$Zn$ has a higher ionization enthalpy than $Ga$. Thus,the statement that $Ga$ is higher than $Zn$ is incorrect.

Which of the following statements is incorrect?

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