Statement 1 (S1): Both $C O_{2}$ and $H_{2} O$ are molecules.
Statement 2 (S2): A molecule always contains atoms of different elements.

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Solution

A molecule is formed by the chemical combination of two or more atoms.
If the same atoms combine to form a molecule, it is known as a molecule of an element. Moreover, if different atoms combine to form a molecule, it is known as a molecule of a compound.

Examples of molecules of elements are: $H_{2}$ , $N_{2}$ , etc.

Examples of molecules of compounds are: $C O_{2}$ , $N H_{3}$ , $H_{2} O$ , etc.

Hence, statement 1 is true but statement 2 is false.

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C O_{2}

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Statement 2: A molecule can have only similar kind of atoms.

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Statement 2: A molecule can only have atoms of same element.

C O_{2}

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