Which of the following statement is incorrect for \( \mathrm{P} \) ...

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Which of the following statement is incorrect for
\( \mathrm{P} \)
group 15 elements?
W
(1) Order of ionization enthalpies is
\[
\Delta_{\mathrm{i}} \mathrm{H}_{1}\Delta_{\mathrm{i}} \mathrm{H}_{2}\Delta_{\mathrm{i}} \mathrm{H}_{3}
\]
(2) The boiling point and melting point increases from top to bottom in the group
(3) Dinitrogen is a gas while all others are solids
(4) All statements are correct
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