Statement 1: 1 dozen banana from vendor A may not weigh the same as 1 dozen banana from vendor B.

Statement 2: 1 mole oxygen from chemist A may not weigh the same as 1 mole oxygen from chemist B.

Statement 1: 1 dozen of banana from vendor A may not weigh same as 1 dozen banana from vendor B.

Statement 2: 1 mole of oxygen from chemist A may not weigh same as 1 mole oxygen from chemist B.

Statement 1: 1 dozen banana from vendor A may not weigh the same as 1 dozen banana from vendor B.

Statement 2: 1 mole oxygen from chemist A may not weigh the same as 1 mole oxygen from chemist B.

Statement 1: If two figures A and B are congruent, then they must have equal area.

Statement 2: If two figures A and B have equal area, then they must be congruent.

Statement 1: Carbon always forms covalent bond with other elements.
Statement 2: $C^{+4}$ and $C^{-4}$ ions are highly unstable.