In the sentence 'The rational is rewarded'. Why is rational an adjective in the sentence.

Because the word "rational" takes on the function of modifying the noun, in addition to representing a characteristic.

Explanation:

Adjectives are words that accompany a noun and modify it, adding a characteristic that particularizes that noun. In this case, we can say that in the sentence above, the word "rational" is the adjective, since it specifies what is "rewardable".

It should be noted that adjectives accompany nouns in number, gender and degree.

the black night was split open like the coconut

it says that it was totally black in the mind of a person but suddenly his mind opened like a coconut with the sweetness of the coconut water and the white color inside it.

or

the black night was thrown like a coconut and it slit apart with its sweet water coming out .

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explanation: