Which of the following statements is incorrect?....

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Which of the following statements is incorrect?
P
(1) The second ionization energy of sulphur is greater than that of chlorine
(2) The second ionization energy of phosphorus is greater than that of aluminium
(3) The first ionization energy of alumunium is approximately the same as that of gallium
(4) The second ionization energy of boron is greater than that of carbon


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