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.

0 Answers   ABC,

---

How long we can use hygroscopic reference standard in terms of water absorb.I mean in line with respective monograph's specification or more than that?

1 Answers  

---

Why sodium lamp is used as source of Polarimeter?

12 Answers   College School Exams Tests, Hetero, NCL, Zydus Cadila,

---

How to make up 100ml of a solution cintaining compound A at 95µg/ml and compound B at30µg/ml for an HPLC reference standard.

3 Answers  

---

how v can identify functional groups by wet techniques?

2 Answers  

---

What is discriminating media? How can u justify/select that which media (pH etc...)is suitable for your dissolution study of your compound?

5 Answers   Natco, SUN,

---

If change in specification which parameter require to do for validation? if change in chromtographic condition then which parameter? if api change then which parameter? if change composition then which parameter? if old method not work out then whicj parameter? if additional one impurity added then which parameter of validation require to do on above each conditions? elaborate separately

0 Answers  

---

why linerity not use in GC but use in HPLC ?

6 Answers  

---

Why we are using K2Cr2O7 for control of absorbance in UV?

2 Answers  

---

what is polarity and how to calculate

2 Answers   Reddy Labs,

---

UV and PDA detector, which have less signal to noise ratio?

0 Answers  

---

what is mean by theoritical plates(not formula) ?

4 Answers   Micro Labs,

---