Find out which part of the sentence has an error : The first five questions,  are difficult,  but the rest,  is easy 1 2 3 4

The first five questions are difficult but the rest is easy

is easy

The part of the sentence that has an error is option 4: "is easy". The noun "rest" is singular, so it should agree with a singular verb form. The correct verb form is "are", not "is". The corrected sentence is: The first five questions are difficult, but the rest are easy.