Which statement on a mass spectrum is TRUE Molecular ion peak is a radical ion w

Question

Which statement on a mass spectrum is TRUE Molecular ion peak is a radical ion with the same molecular weight as the original molecule Molecular ion peak is the largest peak in a spectrum Hard ion source gives strong molecular ion peak and fragmental peak In gas chromatography, what is the main advantage of a FID over a TCD It is more sensitive to most organic compounds It is more sensitive to H_2O and CO_2 It is selective for compounds with electronegative groups It is less sensitive to gradient elution It is non-destructive The absorption frequency of ^13C in a 2.4 T magnetic field is_______The follow ing three compounds are separated by HPLC using normal phase chromatography. What is the order to be eluted from first to last _______hexane, l-hexanol, I-bromohexane 11.1000 cm^-1 of radiation lies in what spectral domain____________In gas-liquid chromatography, a number of factors can lead to band broadening. Which factor below will NOT cause band broadening large particles packing thin layers of stationary phase thick layers of stationary phase slow injection rates if a 200 MHz (^1H resonance frequency) NMR spectrometer has a magnetic field strength of 4 69 T. what would be the strength of magnetic field of a 600 MHz NMR spectrometer_______ What is the most commonly used columns in gas-liquid chromatography________ Which of the following conditions would you choose to separate a mixture consists of highly volatile components higher column temperature lower column temperature thinner stationary phase thicker stationary phase I and III II and III II and IV I

Explanation / Answer

Question 7. Option C.

A mass spectrum will usually be presented as a vertical bar graph, in which each bar represents an ion having a specific mass-to-charge ratio (m/z) and the length of the bar indicates the relative abundance of the ion. The most intense ion is assigned an abundance of 100, and it is referred to as the base peak. Most of the ions formed in a mass spectrometer have a single charge, so the m/z value is equivalent to mass itself.

The molecular ion is also the base peak.

Question 8. Option A. The main advantage of a FID over a TCD is that is more sensitive to organic compound and can be used to analize smaller quantities of sample. It also does not respond in water, so it can be used to analize aqueous solutions.

Question 10. The elusion order goes from the most polar compound to the least polar. So the order would be 1-hexanol, 1-bromohexane, and hexane.

Question 11. This frequency corresponds to microwaves specters.

Question 15. Volatile compounds are the one with lower boiling point, so I'll have to use a lower column temperature, and a thicker column. So option C, II and IV would be the correct option.

Hope this helps.

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