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2 981
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2 982
Absorption of radiation in the UV range attributable to n→n* electronic transitions is characteristic of compounds
2 982
The absorptivity of a standard sample is 312 of (1% w/ w/v) a solution measured at a path length of 1 cm, and the absorbance of the sample was 0.624 at wavelength 254 nm. What is the concentration of the sample?
a- 5 g/100ml
b- 15 mg/100 ml
c- 2 g/100ml
d- 12 mg/100 ml
e- 2 mg/100ml
2 982
Characteristic absorption of organic compound in UV-Vis. At concentrated solution we have -ve or +ve deviation which may be due to:
2 982
Ultraviolet and visible (UV-Vis). The principles of this spectroscopy are:
a. The UV radiation region extends from 0 nm to 450 nm
b. The Spectroscopic Techniques are based on the fact that absorption is directly proportional to the concentration of the absorbing component
c. Visible radiation region extends from 450 nm to 980 nm.
d. Near UV Region: 200 nm to 1000 nm
e. Far UV Region: below 100 m studied under vacuum condition
2 982
Regarding the pharmaceutical application of UV spectroscopy. All of the following statements are true EXCEPT:
2 982
The absorbance of a chromophore was affected by the pH of the medium. Which one of the following action results in a Bathochromic shift?
2 982
Electromagnetic radiation refers to the waves of the electromagnetic field.
Which one of the following radiations has the maximum wavelength?
