Q3 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry – General · Marks: 2 · Difficulty: Easy
In spectrofluorimetric determination in solution
(a)absorbance of analyte solution is kept near to 0.05
(b)oxygen is eradicated from solution
(c)pH of solution is controlled
(d)wavelength of incident light is always above 400 nm Correct from the above is (1)A, B and D (2)B, C and D (3)A, B and C (4)A, C and D
Answer
Answer (as printed): C
Explanation
(a) In spectrofluorimetry the wavelength of incident light can range from 200 nm to 900 nm. (b) Intensity and colour of the fluorescence of many substance depends upon the pH of solutions. (c) Since, presence of O2 decreases the fluorescence, thus oxygen is eradicated from the solution. (d) In flourimetry absorbance of analyte solution is generally kept near to 0.05.
Explanation as extracted from the printed page; notation may be imperfect.
Study loop for Analytical Chemistry