Question

25. The isotopic substitution in the molecule changes its
a) internuclear distance
Vo reduce mass
c) bond angle
d) None of these
13.​

Answer 1

Answer:

None of these because the answer is Isotopic substitution

Explanation:

Isotopic substitution will affect the entire molecule (to a certain extent), so it is not only the vibrational modes for the substituted atom that will change, but rather the vibrational modes of all the atoms of the molecule.

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Answer 2

Answer:

The isotopic substitution in a molecule changes its reduced mass.

Therefore, the option (b) is correct.

Explanation:

• If an atom in the molecule is replaced by its isotope is called isotopic substitution. The resulting substance has identical chemical properties as original substance, even no change in the bond length of the molecule.
• But there is change in the reduced mass (μ) of the molecule.

         $\mu=\frac{m_{1}m_{2}}{m_{1}+m_{2}}$

• For an example carbon monoxide ¹²C¹⁶O, when C-12 is substituted by C-13 then we get ¹³C¹⁶O molecule.  Therefore, the reduced mass of ¹²C¹⁶O is μ and reduced mass of  ¹³C¹⁶O is μ' .

        $\mu_{CO} = \frac{(12)(16)}{12+16}=6.857$

        $\mu'=\frac{(13)(16)}{13+16} =7.172$

        Therefore, the reduced mass of μ' is greater than μ.

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