Revocation how made? Section 6 of Indian Contract Act 1872
6. A proposal is revoked-
(1) by the communication of notice of revocation by the proposer to the other party;
(2) by the lapse of the time prescribed in such proposal for its acceptance, or, if no time is so prescribed, by the lapse of a reasonable time, without communication of the acceptance;
(3) by the failure of the acceptor to fulfil a condition precedent to acceptance; or
(4) by the death or insanity of the proposer, if the fact of his death or insanity comes to the knowledge of the acceptor before acceptance.
Section 2 - Interpretation clause
CHAPTER I THE COMMUNICATION, ACCEPTANCE AND REVOCATION OF PROPOSALS
Section 3 - Communication, acceptance and revocation of proposals
Section 4 - Communication when complete
Section 5 - Revocation of proposals and acceptances
Section 6 - Revocation how made
Section 7 - Acceptance must be absolute
Section 8 - Acceptance by performing conditions, or receiving consideration
Section 9 - Promises, express and implied
CHAPTER II CONTRACTS, VOIDABLE CONTRACTS AND VOID AGREEMENTS
Section 10 - What agreements are contracts
Section 11 - Who are competent to contract
Section 12 - What is a sound mind for the purposes of contracting
Section 14 - Free consent defined
Section 16 - Undue influence defined
Section 18 - Misrepresentation defined
Section 19 - Voidability of agreements without free consent
Section 19A - Power to set aside contract induced by undue influence
Section 20 - Agreement void where both parties are under mistake as to matter of fact