True/False Qns are supposed to be easier than MCQ, rite?

went through some 30 qn mcq n T/F test this afternoon,
technically it should be a breeze but then....

it seems that the true/false Qns are harder than those mcq ones.
by right, each true/false Qn has a probability of 50% of being correct as compared to MCQs with 5 choices, aka 20% of being correct.
but then the Qns are phrased in such a tricky manner than it seems that answering True may not be entirely true after all.

sample qns:

"A protein crystal is made from only one protein molecule, True or False?"

"When water turns into ice, it's molecular structure is changed, True of False?"