3. Основные свойства гидроксидов увеличивается в ряду

The basicity of hydroxides increases with increasing atomic number of the metal in the same period and decreases with increasing atomic number in the same group. The given options show trends. Option (a) NaOH → KOH → LiOH shows increasing basicity from left to right (LiOH is more basic than KOH, which is more basic than NaOH). Option (b) shows a mix. Option (c) Be(OH)2 → Mg(OH)2 → Ca(OH)2 shows increasing basicity down the group. Option (d) shows a mix. The question asks for increasing basicity. In period 3, the basicity of hydroxides decreases from left to right (NaOH > Mg(OH)2 > Al(OH)3). In group 1, basicity increases down the group (LiOH > NaOH > KOH). In group 2, basicity increases down the group (Be(OH)2 < Mg(OH)2 < Ca(OH)2). The series NaOH → KOH → LiOH is incorrect as LiOH is more basic than KOH. The series Be(OH)2 → Mg(OH)2 → Ca(OH)2 shows increasing basicity.