Consent is said to be free when it is not caused by--- (1) coercion, as defined in section 15, or (2) undue influence, as defined in section 16, or (3) fraud, as defined in Section 17, or (4) misrepresentation, as defined in Section 18, or (5) mistake, subject to the provisions of Section 20, 21 and 22. Consent is said...