CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

Glasses are considered as super cooled liquid because they are amorphous solids. These solid do not show a long rangs order in arrangement of particles. They have a tendency to flow though very slowly. That is why glass panes of old windows are thicker at base then at top.

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Siddhant Kumar 8 years, 3 months ago

Glasses are called as supercooled liquid because it has tendency to flow in molten state.

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Structure or glucose

Posted by Aman Choudhary 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Why tertiary alkyl hallide goes sn1 faster?

Posted by Surbhi Maindola 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is beta hydrogen?

Posted by Raihaan Ahmed 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Amar Kumar 8 years, 3 months ago

Hydrogen attached to an alpha carbon is called an alpha-hydrogen (α-hydrogen), a hydrogen on the beta-carbon is a beta-hydrogen.

The alpha carbon is the first carbon that attaches to a functional group (the carbon is attached at the first, or alpha, position). The second carbon is the beta carbon.

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An alkene(A) on reductive ozonolysis yields acetone and an aldehyde. The aldehyde is easily oxidised to (B).(B) on Treatment with br2 in the presence of phosphorus yields a compound (C) which on further hydrolysis gives a hydrozy acidic hydrolysis . Deduce the structure s of A, B , C and D . Write the sequence of reaction involved.

Posted by Amit Yadav 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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List of reactions to be learned for board in organic chapter wise

Posted by Sidhant Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What are the imp. Topics of p block and d and f block elements?

Posted by Deepika Kashyap 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Kmno4 on heating -

Posted by Puja Sharma 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is Crystal field theory in short (tell me it's significance)

Posted by Rachit Goyal 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Write the product when CH3CHO react with 2,4-DNP

Posted by Abhineet Raj 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Predict the product of electrolysis at cathode and anode where electrolysis of an aqueous solution of AgNO3 using inert electrode

Posted by Abhineet Raj 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is Can't Hoffs factor

Posted by Srishti K 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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How much marks organic chemistry came in board examination

Posted by Arya Tyagi Arya 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Tanuja Biswas 8 years, 3 months ago

Total weightage of the four chapers of organic chemistry is 18 marks?

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Solution

Posted by Ram Kumar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Formula of molarity

Posted by Shrimai Puri 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Prachi Agarwal 8 years, 3 months ago

Moles of solute /volume of solution (litre)

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What is hydration

Posted by Surjit Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Vaibhav Dhingra 8 years, 3 months ago

Addition of water

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What is alpha hydogen

Posted by Sooraj Rawat 8 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Rachit Goyal 8 years, 3 months ago

That hydrogen which is attached to alpha carbon and alpha carbon is that to which functional group is attached

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Rohit Bisht 8 years, 3 months ago

H attached to alpha carbon

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Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 3 months ago

Hydrogen attached to that carbon which is attached to some negative particles

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Vector ware test is important

Posted by Rajan Thakur 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Bisht 8 years, 3 months ago

Yes victor mare test is imp

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what is zeigler natta catalyst

Posted by Nidhi Mishra 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Amar Kumar 8 years, 3 months ago

A Ziegler–Natta catalyst is a catalyst named after Karl Ziegler and Giulio Natta, which is a used in the synthesis of polymers of 1-alkenes.

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Rajan Thakur 8 years, 3 months ago

It is triethylaluminium and titanium tetra chloride .

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NACL being fact has coordination no. 6 while it should be 12 as given on page no.16 ncert chemistry.

Posted by Chitra Sharma 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is the significance of leaching in the extraction of aluminium?

Posted by Aman Jaiswal 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Amar Kumar 8 years, 3 months ago

The impurities are then filtered and the solution is neutralized by passing CO₂ gas. In this process, hydrated Al₂O₃ gets precipitated and sodium silicate remains in the solution. Precipitation is induced by seeding the solution with freshly prepared samples of hydrated Al₂O₃. Hydrated alumina thus obtained is filtered, dried, and heated to give back pure alumina (Al₂O₃).

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Amar Kumar 8 years, 3 months ago

In the extraction of aluminium, the significance of leaching is to concentrate pure alumina (Al₂O₃) from bauxite ore. Bauxite usually contains silica, iron oxide, and titanium oxide as impurities. In the process of leaching, alumina is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523 K and 35-36 bar. Under these conditions, alumina(Al₂O₃) dissolves as sodium meta-aluminate and silica (SiO₂) dissolves as sodium silicate leaving the impurities behind.

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