Sections 142-144 of the Indian Contract Act collectively address the invalidity of guarantees. Section 142 invalidates guarantees obtained through misrepresentation by the creditor, Section 143 invalidates guarantees obtained by concealing material facts, and Section 144 invalidates guarantees given on condition that another person will also join as co-surety if that condition is not fulfilled. These protect the surety from being bound by guarantees procured through unfair means.

1. 1 Pick up Indian Contract Act, 1872.
2. 2 Go to Chapter VIII — Indemnity and Guarantee.
3. 3 Check Sections 142-144:
4. 4 - S.142 → guarantee obtained by misrepresentation = invalid ✓
5. 5 - S.143 → guarantee obtained by concealment = invalid ✓
6. 6 - S.144 → guarantee on unfulfilled condition = invalid ✓
7. 7 Sections 145-146 deal with other guarantee matters, not invalidity.

The text reads: Section 142: Guarantee obtained by misrepresentation → invalid. Section 143: Guarantee obtained by concealment → invalid. Section 144: Guarantee given on condition of co-surety joining, if condition not met → invalid.