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How nitrogen has covalency 4?

Posted by Shilpa Yadav Shilpa 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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What is craft temperature and CMC

Posted by Tushar Singh 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why is ferric chloride preferred Over potassium chloride to stop bleeding?

Posted by Ashi Yadav 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why does potassium lighter than sodium?

Posted by Gunada Das 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Upto what time we must have complete r syllabus???if it is not yet completed than we should start revising or continue completing it????

Posted by Sahana Roy 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Soumya Sakshi 8 years, 4 months ago

I think as our Target is board exam and that is in march.so try to complete the entire syllabus upto15 december.then revise in the rest 15 days of December. solve sample paper in the rest two months and thus you are ready for your exam.i think planning is important.you will pass out with flying colors.

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High level

Posted by Kashish Patel 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Chlorofrom is a chlorine compound but gives no reaction with silver nitrate solution why?

Posted by Harmandeep Kaur 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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What is protic acid?

Posted by Nikhil Garg 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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What is coagulation in a basic term?

Posted by Pooja Dhandre 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Soumya Sakshi 8 years, 4 months ago

Accumulation

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Why manganese and technetium has lower melting point

Posted by Amarjot Kaur 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Sri Krishna 8 years, 4 months ago

They exist as liquid

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Can you explain me swartz reaction ??

Posted by Abhishek Ksp 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Varun Banda 8 years, 4 months ago

In swartz reaction alkyl chlorides or bromides react with metallic floride like AgF,Hg2F2,CoF2,and SbF3 to form alkyl florides. R-X + AgF - R-F + Ag-X X=Cl,Br

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How to remember things in study

Posted by Anuj Srivastava 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Formula of boroform

Posted by Shishu Tripathi 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Amar Kumar 8 years, 4 months ago

CHBr₃

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What is the role of chlorite in the extation of aluminum

Posted by Vishal Chouhan 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Formula for boroform

Posted by Manjot Singh 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Meetesh Dwivedi 8 years, 4 months ago

CHCl3-chloroform,CHI3-iodoform,like that only CHBr3-bromoform

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Why proton survive in nucleus?

Posted by Manish Ojha 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Meetesh Dwivedi 8 years, 4 months ago

Becoz neutron continuosly converts into proton +electron,which maintains its presence

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All the name reactions of chapter alcoho,phenol,and ethers

Posted by Yashasvi Dhadse 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Meetesh Dwivedi 8 years, 4 months ago

Given in n.c.e.r.t

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Conversion of aniline to chlorobenzen

Posted by Rashmi Kaushal 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Is light matter or not?

Posted by Sandeep Walia 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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why there is only 2 electron in a orbital

Posted by Mohit Kumar 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Mohit Kumar 8 years, 4 months ago

due to Pauli exclusion principle

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Why alcohols are used in cough syrups

Posted by Apurva Verma 8 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Amar Kumar 8 years, 4 months ago

Most cough syrups contain menthol and natural extracts, for carminative and antitussive actions. These substances are water-insoluble and so alcohol is used as a solvent. Alcohol is miscible in all proportions with many of the syrups and so is the solvent of choice for many preparations. This property is rendered by its R-OH (hydroxyl) group which increases miscibility via inter molecular hydrogen bonding with solute particles. This enables the syrup to be absorbed easily by the body.

In addition syrups are mainly made of gels which in turn contain a liquid (as dispersed phase) and a solid (as dispersion medium). In them, alcohols play the role of stabilizers by preventing coagulation of solute particles during storage.

Alcohol serves as a preservative and stabilizer in syrups. Alcohols are good sedatives and hypnotics as they depress the activity of the central not nervous system and lead to sleep. As a result they reduce the irritation in the throat and also reduce coughing.

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Why vinyl halide is inert towards SN1 and SN 2 both reaction mechanisns ?

Posted by Ruhi Kumari 8 years, 4 months ago

CBSE > Class 12 > Chemistry