Here is your answer
a) turns blue litmus red
EXPLANATION:
It is the property of an acid that it always turns litmus paper to red. It will never turn a litmus paper to blue.
So, option (a) is not a property of an acid.
For other options:
An acid can neutralize base (not always, but this is a property of an acid)
An acid can corrode all the active metals.
HOPE IT IS USEFUL
