Class 12 Chemistry · Chapter 14 · Test 1
NMR Principles
45 MCQs
45 questions · 35 min · 45 marks
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Sample questions
The first 5 of 45. Try each one, then tap to see the answer.
Question 1
NMR spectroscopy relies on the magnetic properties of nuclei known as:
- AChemical shift
- BNuclear density
- CNuclear spin
- DSignal intensity
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Answer: C
Nuclei with spin behave like tiny magnets.
Question 2
Which nuclei usually give signals in NMR spectroscopy?
- ANuclei with even mass numbers
- BNuclei with odd mass numbers such as 1H and 13C
- CAll nuclei equally
- DOnly nuclei of metals
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Answer: B
Atoms with odd mass numbers usually show NMR signals.
Question 3
The 12C nucleus is NMR inactive because it has:
- ANo protons
- BAn odd mass number
- CA negative charge
- DAn even number of protons and neutrons so its magnetic effects cancel
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Answer: D
Equal numbers of protons and neutrons give no net magnetic field.
Question 4
The 13C nucleus gives NMR signals because it has:
- AAn odd number of neutrons so it has magnetic spin
- BAn even number of neutrons
- CNo neutrons
- DA full outer shell
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Answer: A
The odd number of neutrons gives it nuclear spin.
Question 5
In the absence of a magnetic field nuclei have:
- AAll the same orientation
- BTwo different energies
- CRandom orientation and the same energy
- DZero mass
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Answer: C
Alignment occurs only when a field is applied.
More tests in SPECTROSCOPY-2 NMR
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