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How nitrogen has covalency 4?

Posted by Shilpa Yadav Shilpa 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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What is craft temperature and CMC

Posted by Tushar Singh 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Why does potassium lighter than sodium?

Posted by Gunada Das 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Soumya Sakshi 8 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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What is protic acid?

Posted by Nikhil Garg 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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What is coagulation in a basic term?

Posted by Pooja Dhandre 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Soumya Sakshi 8 years, 1 month ago

Accumulation

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Why manganese and technetium has lower melting point

Posted by Amarjot Kaur 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Sri Krishna 8 years, 1 month ago

They exist as liquid

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Can you explain me swartz reaction ??

Posted by Abhishek Ksp 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Varun Banda 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Formula of boroform

Posted by Shishu Tripathi 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Amar Kumar 8 years, 1 month ago

CHBr₃

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What is the role of chlorite in the extation of aluminum

Posted by Vishal Chouhan 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Formula for boroform

Posted by Manjot Singh 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Meetesh Dwivedi 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Meetesh Dwivedi 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Meetesh Dwivedi 8 years, 1 month ago

Given in n.c.e.r.t

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Conversion of aniline to chlorobenzen

Posted by Rashmi Kaushal 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Is light matter or not?

Posted by Sandeep Walia 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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why there is only 2 electron in a orbital

Posted by Mohit Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Mohit Kumar 8 years, 1 month ago

due to Pauli exclusion principle

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Why alcohols are used in cough syrups

Posted by Apurva Verma 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Amar Kumar 8 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry