"The" is a definite article which is used before a noun that is fixed, special or discussed earlier. "A/An" is used before an indefinite singular noun. "Union leader" is a fixed noun. Hence "the" will be used.
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Q. There is . . . . . . . . Kalidas in my class.
Q. My father is . . . . . . . . teacher.
Q. . . . . . . . . Quran is a holy book of the muslims.
Q. Idioms and phrases for - To hold a brief for
Q. Find the odd number / letters / word from the given alternative.
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