Interview Questions Answers in Analytical Chemistry

ramalaxmi

{ City } bangalore
< Country > india
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User No # 78231

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Question { Aurobindo, 201627 }

Why we use caffeine for HPLC calibration in Detector wave
ength accuracy test

Answer

It,is a primary standard.and very stable
it can detect multiple wave lenths. another standards also there
examples are benzophenone,uracini,harbium perchlorate extra

Is This Answer Correct ?

0 Yes

0 No

Question { Dr Reddys, 35278 }

Why we are using only KBr in IR spectrometer why not KCl

Answer

KBR can not absorbance in IR region. and it is a primary standard.
KBR does not catch the moisture easy better than KCL
KBR STABLE also

Is This Answer Correct ?

10 Yes

2 No

Question { Dr Reddys, 98362 }

what is least count of a balance? How we find out this? Any
formula for least count of Analytical balance?

Answer

0.01mg is the least count of balance

Is This Answer Correct ?

17 Yes

32 No