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

Why is maximum pH14. Why does it range from 0-14 only?

IISER,

4 8562

PLease give me the list of normal phase hplc column

Micro Labs,

3 7305

Why purity angle should be less than purity threshold in peak purity

4209

Suppose u have combipack product and u get 2 or more peaks which are other than there placebo then what we can do

2278

What is the principle of Particle size analysis and zeta potential

2609

suppose u got 2 or more maxima in the uv spectrophotometer then what u can do

Hetero,

2 5104

What is the difference between specified impurity and Identified impurity

Glenmark,

3 16072

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 5999

how do you established the RRF for unknown impurity

Square Pharma,

6 12955

I want analyze my compound at 325 nm so which standard shall i use to calibrate my HPLC system? How i can assure my hplc detector is suitable or not?

AMRI,

3 9980

What is the temperature

Reddy Labs,

1 8065

How we will choose pH of a mobile phase if analyte pKa value is 4

Celon Labs, Laurus,

2 11282

what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

DRL, Laurus,

3653

Which column is more polar, C8 or C18?

Cipla, Glenmark, Laurus, Torrent Power,

6 30159

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 18022

Un-Answered Questions { Chemistry }

When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason?? When a cool glass rod is suddenly heated, it cracks. Why?

990

Which is the highly polar and highly non polar column in HPLC?

2263

What is use of acetonitrile compare to methanol in RP-HPLC Method development?

1969

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

2093

What is the accrptance criteria in RSD for RS method precision on basis of impurity percentages?

785

What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

1871

Explain Thiele's structure for benzene. What is the difference between thiele's structure and modern structure (resonance hybrid) of benzene?

5163

What is specific conductivity?

1047

Why is the color of the indicator drop remains the same at the end point?

1190

Why is glass electrode called an ion selective electrode?

980

what is procedure of actual procedure for registration of drug?

1975

Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.

1401

in sampling of raw material which side is pasted sampled labels

1807

What are the advantages of potentiometric titration?

1054

in which situation ion pair agent require to use?

700

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