Q70 · CSIR-NET Chemistry, June 2019

Paper: CSIR-NET June 2019 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Medium

The correct statements about HCl and DCl , among the following is
(a)DCl has smaller Zero Point Energy than HCl
(b)HCl has smaller vibrational frequency than DCl
(c)The force constant k for HCl bond is half that of DCl
(d)The reduced mass of DCl is smaller than that of HCl
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Same force constant, larger reduced mass: DCl vibrates more slowly and has the smaller zero-point energy (½hν).

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