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Which of the following is inversely proportional to the chemical shifts positions (δ)?

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Which of the following is inversely proportional to the chemical shifts positions (δ)?

(a) Frequency of unknown group of protons

(b) Frequency of TMS

(c) Operating frequency of the instrument

(d) All of the mentioned

The question was posed to me in a job interview.

Query is from Nuclear Magnetic Resonance in division Absorption Spectroscopy of Engineering Chemistry I

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Right choice is (c) Operating frequency of the instrument

Explanation: Operating frequency of the instrument is inversely proportional to the chemical shifts positions (δ).

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