Class 12 Chemistry · Chapter 13 · Test 3
Mass Spectrometry
44 MCQs
44 questions · 35 min · 44 marks
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Sample questions
The first 5 of 44. Try each one, then tap to see the answer.
Question 1
In mass spectrometry molecules are bombarded with high energy electrons to form:
- APositive ions
- BNegative ions
- CNeutral atoms
- DFree radicals only
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Answer: A
A molecule loses an electron to form a positive ion.
Question 2
The m/e value of an ion is its:
- AMass x charge
- BMass to charge ratio
- CEnergy to mass ratio
- DMass of electron
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Answer: B
The detector records m/e against the percentage of ions.
Question 3
The relative abundance of Cl-35 and Cl-37 is:
- A50% and 50%
- B25% and 75%
- C75% and 25%
- D90% and 10%
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Answer: C
This gives a 3:1 ratio.
Question 4
The heights of the peaks in a mass spectrum show the:
- AMass of the isotopes
- BCharge of the ions
- CEnergy of the ions
- DProportion of each isotope present
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Answer: D
Taller peaks mean greater abundance.
Question 5
The relative atomic mass of an element is calculated as:
- AΣ(isotopic mass x abundance) / 100
- BSum of isotopic masses
- CHighest isotopic mass
- DLowest isotopic mass
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Answer: A
It is a weighted average of the isotopic masses.
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