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

A neo group is a group that has three methyl groups at the end and AT LEAST five carbons total, ie there is a secondary carbon connecting the branching side chain to the main chain. A tert-butyl group is a branching side chain that contains three methyls at the end and connects to the main chain via the tertiary carbon (once it is bonded to the chain, it is quaternary). The tert-butyl group is a sub-class of the neo branching. If you look at the example again, you will see that tert-butyl has FOUR carbons not five and thus could not be neopentyl. You should have the lowest possible sum of the positions of the substituents. This works for the example on page 68 as well.

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Calculate the packing efficiency scc

Posted by Himanshu Arya 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Tushar Kumar 7 years ago

Spheres present at the corner=8 Contribution=1/8 No. Of spheres per unit cell at the corner=8×1/8 =1 Volume of one sphere=4/3pi r^3 Volume of cube=a^3 =(2r)^3=8r^3 {Here a=2r bcz the spheres (of radius ,r) of the unit cell r attached to each other,so r+r=2r} P.E=(volume of one sphere/volume of cube)×100 =(4/3pi r^3/8r^3)×100 =52.4%

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Is group 15 removed from p block for 2019-20 session??

Posted by Priya Pahal 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Yakshi Baliyan 7 years ago

yes because it has been added in class 11th syllabus

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Sia Mourya 7 years ago

Yes dear ?

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Which is the best book for chemistry

Posted by Lucky Singh 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Christin Mathew 7 years ago

Modern abc + organic chemistry

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Ritik Ranjan 7 years ago

Ncert is the bible of chemistry

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Differences between rate of reaction and rate constant

Posted by Kanchan Yadav 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Astha Dewangan 7 years ago

Rate of reaction *It depend on the molar concentration of the reactant and product. *It depend on time for the reaction. *It depend on tempreature indirectly. Rate of constant *It does not depend on molar concentration. *It does not depend on time for the reaction. *It depend on tempreature.

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How much charge is required for 1 mol of MnO4- to Mn2+

Posted by Sneha Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Abhishek Kumar 7 years ago

5*f

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Chemistry class 12 syllabus for 2019 2020

Posted by Vishvjeet Singh Rajput 7 years ago

CBSE > Class 12 > Chemistry

3 answers

Anushka Gupta 7 years ago

Yes it is not available Can anyone please tell me what's the syllabus

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Navneet Kaur 7 years ago

Available on this site

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Ayush Verma 7 years ago

Not available yet

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Why does a solution containing non-volatile solute have higher boiling point then the pure solute.why it the evolution of boiling point a colligative properties.

Posted by Prashant Gandhi 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years ago

The boiling point of substance can be defined as, it is the temperature at which the vapour pressure of the substance equal to atmospheric pressure. According to Raoult's law, the vapour pressure of a solvent decreases in the presence of a non-volatile solute. Thus, the vapour pressure of a solution containing a non-volatile solute requires a high temperature to become equal to the atmospheric pressure. That is why the boiling point of a solution containing a non-volatile solute increases. Thus, the solution containing a non-volatile solute has a higher boiling point than a pure solvent. Example of non-volatile solute sugar, NaCl. etc.

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H2S a toxic gas with rotten egg like smell is used for qualitative analysis if the solubility of H2S is water and STP is 0.195 M calculate Henry's law of constant

Posted by Navpreet Kaur 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

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Is solid state is remove from syllabus 2019-2020

Posted by K@Lp@N@ Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aditya Raj 7 years ago

Wait till first week of april.

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What is the limitation of Henry law

Posted by Yashank Bharadwaj 7 years ago

CBSE > Class 12 > Chemistry

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Show me chemistry paper

Posted by Ankita Toshawra 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Aditya Raj 7 years ago

But this app do not contain these facilities.

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Subhi ? 7 years ago

Ya i also wanna see..

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Is solid state is in syllabus for 2019-2020 session

Posted by Avinash Kumar 7 years ago

CBSE > Class 12 > Chemistry

0 answers

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Why do solids have high melting and boiling point?

Posted by Shakshi Rana 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Nancy Rajput 7 years ago

solids have more force of attraction as compared to liquids as the molecules in a solid are tightly packed. to overcome this force of attraction, moreheat energy is needed.

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Subhi ? 7 years ago

Becz their constituent particles are closely packed and bonded with strong force of attraction ..

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Why do solids have high density and low compressibility?

Posted by Shakshi Rana 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Subhi ? 7 years ago

Bcz their atoms or molecules are closely packed in ordered manner so they have high density and their intermoleuar space between them are less then that of liqid hence, they r incompressible...

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Name the parameters that characterize a unit cell?

Posted by Shakshi Rana 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Prakhar J 7 years ago

Position of the particles....

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Shreya Dixit 7 years ago

Angle and sides of the unit cell

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Why do solids have definite volume?

Posted by Shakshi Rana 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Kawalpreetsingh Sandhu 7 years ago

Here definite volume means means fixed amount of space that something fills. Solids have definite volume because they have strong intermolecular forces of attraction. The constituent paricles of solids cant move from their position.

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Calculate the molarity of 20per cent aqueous ethanol solution by volume (density of solution =0.960g/m3).Assume a solution to be ideal.

Posted by Sataybir Sataybir 7 years ago

CBSE > Class 12 > Chemistry

0 answers

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explain the frankel and shot key effect

Posted by Himanshu Arya 7 years ago

CBSE > Class 12 > Chemistry

0 answers

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What is the amorphous solid

Posted by Himanshu Arya 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Aditya Raj 7 years ago

True ,but "Pseudosolid".

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Alia Siddiqui 7 years ago

Amorphos solid are isotropic solid which are irregular in shape and doesnt have definite enthalpy of fusion When we cut them with a sharp knife they cut into 2 pieces with irregular surface They are also called psedi solids and super cooled liquids

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The mole fraction of a solution of ethyl alcohol in water is 0.06.Then what is the mass of ethanol dissolved in 1 litre of water?

Posted by Shakshi Bhardwaj 7 years ago

CBSE > Class 12 > Chemistry