Correct. The converse is true.
4. IF two angles are congruent, they are right angles. FALSE>>>>>please check
CONVERSE: If two angles are right angles,then they are congruent angles.
This page says that the original statement is true. Do you have a different definition? The converse is false.
5. If two angles form a linear pair, then they are supplementary.FALSE>>>>>please check
CONVERSE: iF two angles are supplementary, then the two angles (or they) form linear pair.
Correct. The converse is false.
6. Two angles are each acute if they are complementary.TRUE>>>>>please check
CONVERSE: Two angles are complementary angles, if they are acute....
please try to check my work