Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

WAHT IS THE ELUTION ORDER IN GAS CHROMATOGRAPHY?

Micro Labs,

3 9126

what is the defferance between the potency and working standard

Matrix, Orchid, Caplin Point, Arbro Pharmaceuticals, ECOlogics, Venus Remedies,

1 2990

what is the principle involved in determination of moisture content?

3 6987




what is difference between assay&purity&potency?

5 23162

why we do the calibration of limit of stry light in hplc & uv

Cipla,

1318

what is leading peak in hplc

Cipla,

1 9501

what is difference between drug products and drug substance?

DRL,

5 72871

From peak purity spectrum, where or at which point peak purity angle & purity threshold is checked?

Cipla, MSN Pharma,

1 1454




how you determine moist.of NaOH sol or NaOH flacks

927

what is concentration of oxygen in U.H.P. grade N2 cylinder

1 2841

water is more polar than acetonitrile.but in reverse phase chromatography peaks elute earlier when we increse Acetonitrile.what is the reason.

Matrix,

10 34145

I got 88.0 % assay for a drug in HPLC analysis for same injection i got 40.0% related substances is it possible? what is the relation between results of assay and purity?

5 6901

hi i am m.sc organic chem and complete analytical lab tech dipolma now job in qc many time ask question you in m.sc organic why job in qc please help me i can not give proper ans please tell me

Natco, Arch Pharmalabs,

3 6988

why use benzophenone & caffene acetone in hplc calibration

1 11857

why use k2cr2o7 , kcl h2so4 in uv calibration

GVK, DRL,

1 6960


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Un-Answered Questions { Analytical Chemistry }

in gas chromatography what is the difference between gas flow rate and average linear velocity ?

929


How to determine water content of bis tetrazole amine mono ammonium salt

1794


We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?

177


what is the origin to prepare standard operating procedure

880


What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

5473






why we should take dst factor for below 1%moisture samples

1304


What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.

1214


In HPLC Calibration, On which basis RSD Limit of noise test is fixed (NMT 33.0 % )

1890


why we are using hexane in calibration of number of drop per mL

158


2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

799


1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

980


1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

144


what is procedure of actual procedure for registration of drug?

543


why sre you used Potassium hydrogen phthalate in standarisation of 1N NaOH and 0.1 N Perchloric Acid?

6550


how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

1012