Answer Posted / surinder kumar

Gas -Chromatography is based on the adsorption mechanism i.e.
if a substance is strongly adsorbed on the columns then that substance will get eluted in the last moments.
as 1,3 Butadiene gets adsorbed strongly to the columns due to its resonating structures(charged,polar-polar interactions,polar-non polar interactions due to neutral structure)so it gets eluted later than pentane which has no such interactions with the columns phase

in stress study if your api not soluble in hcl naoh h2o2 then what require to do?

813

---

sop of a uv visible spectrophotometer double beam elico model

5879

---

[3/28, 20:52] Manoj P Venkatpurwar: how many impurities require to inject in assay specificity that how we can find out? and in Rs also how?

765

---

when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

2008

---

what are the standard methods for HPLC?

2756

---

function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

2625

---

What is the difference between spectro meter and spectro photo meter?

11400

---

How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

3841

---

CAN WE DETERMINE THE PEAK PURITY IN GAS CHROMATOGRAPHY ANALYSIS?

1170

---

process of Diclofenac sodium,IP.

2168

---

How to set analytical specification for combination products?

794

---

if your impurity coeluting with each other in that situation how require to set specification? is it acceptable?

931

---

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.

2849

---

WHICH STANDARD WE USE IN SILICA ANALYSIS IN SILICA-GEL METHOD FOR SOLID SAMPLE

2096

---

How can we calculate offset value pH measurment

1478

---