Chemistry Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

General Chemistry (478)
Chemistry AllOther (190)

Chemistry Interview Questions

Questions Answers Views Company eMail

WAHT IS THE ELUTION ORDER IN GAS CHROMATOGRAPHY?

Micro Labs,

3 14748

what is the defferance between the potency and working standard

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

1 6076

what is the principle involved in determination of moisture content?

3 10929

what is difference between assay&purity&potency?

5 33721

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

Cipla,

1 4237

what is leading peak in hplc

Cipla,

1 12684

Cholesterol is a compound suspected of causing hardening of the arteries. The formula of cholesterol is C27H46O. a. A sample of cholesterol is isolated from the arterial lining of a 60-year-old American male. What is the formula of this compound? b. Cholesterol is extracted from a chicken’s egg. What is the formula of this compound?

3178

what is difference between drug products and drug substance?

DRL,

5 92442

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

Cipla, MSN Pharma,

1 4522

why we are adding sulpuric acid in residue on ignition

Aurobindo,

2 9219

how you determine moist.of NaOH sol or NaOH flacks

2222

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

1 5110

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

Matrix,

10 52706

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 11917

how to mesure a relation of assay by HPLC and purity in results?

2325

Un-Answered Questions { Chemistry }

Why is the indicator eriochrome black(ebt) shows wine red color at the beginning and blue color at the end?

1460

composition of brass

1881

Why is Francium(Fr) so difficult to react with water?

2181

Why to use propyl paraben in HPLC gradient calibration

7481

how can I make the copper get white bye any salt or acit?

2208

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

9795

Explain the term aliquot and diluent?

1336

What is the unit of conductance?

1059

Why there is no bond with 100% ionic character...??

1818

can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?

2180

in monograph 7 imp are there but in vendor showing 5 imp do not req to include 2 imp for that what will be justification?

720

What is viod volume and peak purity in HPLC?

2884

Did anybody have method for acetyl cysteine effervescnce tablet

2252

what is the significance of control of absorbance in UV?

2256

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

1850

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