Which of the following statements is incorrect :

Question

$\begin{array}{1 1}(a)\;The\; charge\; on\; an\; electron\; and\; proton\; are\; equal\;and\; opposite.\\(b)\;Neutrons\;have\; no \;charge.\\(c)\;Electrons\;and\; protons\; have\; the\; same\; mass.\\(d)\;The\; mass\; of\;a \;proton \;and\;a\;neutron\; are\; nearly\; the\; same.\end{array}$