Section 21 Indian contract Act, Sec 21 Contract Act
21. Effect of mistakes as to law.—A contract is not voidable because it was caused by a mistake as to any law in force in 1[India]; but a mistake as to a law not in force in 1[India] has the same effect as a mistake of fact.
Illustration
A and B make a contract grounded on the erroneous belief that a particular debt is barred by the Indian Law of Limitation: the contract is not voidable.
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