(a) No individual entitled to exemption under two or more of subdivisions (19), (20), (22), (23), (25), (26) and (28) of § 12-81 and under § 12-82 shall receive more than one exemption.

(b) Notwithstanding the provisions of subsection (a) of this section, any individual entitled to the exemption from property tax allowed in accordance with subdivision (22) of said § 12-81 for the surviving spouse of a veteran as defined therein, which individual, except for said provisions of subsection (a) hereof, would also be entitled to the exemption from property tax allowed in accordance with subdivision (19) of said § 12-81 for veterans as defined therein, shall be entitled to receive the amount of exemption allowed under said subdivision (22) as such a surviving spouse and, in addition, the amount of exemption allowed under said subdivision (19) as a veteran qualified for such exemption thereunder.