No, it is a myth.
Chemistry is the chemistry if youre a chemistry then good for you
No, this is not obligatory.
no
No, there is no reason why you should fail in this case.
I'm good at Math and I passed Chemistry.
Not you will but you can.
No.
Not true. Chemistry is easier than Mathematics.
yes. because in chemistry u need math skills and good at biology.
Mathematics is an important part of all the other sciences such as chemistry and thermodynamics; mathematics has rightly been called the language of science. So no, being good at math does not mean that you will fail chemistry, quite the opposite.
Brainstorming
None of those talents or shortcomings is a reliable predictor. You will fail Physics, Chemistry, Engineering, or any other specialty, if you expect it to be so hard that you'll fail it, or if you expect it to be so easy that you'll sail through without work. The decision to fail it or not fail it is your decision to make, and has no connection with what you think you're good at or not good at.