a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nuc

Question

a) Is a nucleus that absorbs at 0.90 ? more shielded or less shielded than a nucleus that absorbs at 3.25 ??

    less shielded  more shielded   

Does the nucleus that absorbs at 0.90 ? require a stronger applied field or a weaker applied field to come into resonance than the nucleus that absorbs at 3.25 ??

    weaker applied field   stronger applied field   




b) Is a nucleus that absorbs at 4.32 ? more shielded or less shielded than a nucleus that absorbs at 1.25 ??

    less shielded  more shielded   

Does the nucleus that absorbs at 4.32 ? require a stronger applied field or a weaker applied field to come into resonance than the nucleus that absorbs at 1.25 ??

    weaker applied field   stronger applied field  

Explanation / Answer

(a) 0.90 ppm is a lower chemical shift than 3.25 ppm

=> more shielded

=> stronger applied field

(b) 4.32 ppm is a higher chemical shift than 1.25 ppm

=> less shielded

=> weaker applied field

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