In general,the properties that decrease and increase down a group in the periodic table respectively are

If the period number and group number of any representative element are the same,then which of the following statements is incorrect regarding such type of element in its ground state? (Period number and group number are according to the modern form of the periodic table)

Match List-$I$ with List-$II$.

List-$I$ (Elements)	List-$II$ (Properties)
$A. Cl, S$	$I. \text{Elements with highest electronegativity}$
$B. Ge, As$	$II. \text{Elements with largest atomic size}$
$C. Fr, Ra$	$III. \text{Elements which show properties of both metals and non-metals}$
$D. F, O$	$IV. \text{Elements with highest negative electron gain enthalpy}$

Choose the correct answer from the options given below:

$(a)$ $Be$ and $Mg$ are alkaline earth metals.
$(b)$ $K^{+}$ has larger radii than $Ca^{2+}$.
$(c)$ All $d$-block elements are transition elements.
$(d)$ $H^{-}$ ion is larger than $F^{-}$.
Incorrect statement is/are

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However,oxygen has lower ionisation enthalpy than nitrogen. Explain.

Which of the following points is never the same for $IP$ and $EA$?