判断下列反应能否发生
(1)NaOH+KCl=KOH+NaCl (______)
(2)2HCl+K2SO4=H2SO4+2KCl (______)
(3)NaCl+KNO3=NaNO3+KCl (______)
(4)KOH+HNO3=KNO3+H2O (______)