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

Wurtz reaction is basically a method to make even number carbon Alkanes with the help of alky halides. We cannot obtain odd number carbon Alkanes and methane from this reaction. Reagent use in this reaction is sodium + dry ether. It is a also called coupling reaction and it proceeds throug free radical mechanism (so the reaction intermediate formed is a free radical).

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Ajay Singh Rajput 6 years, 7 months ago

Adolphe Wurtz, is a coupling reaction in organic chemistry, organometallic chemistry and recently inorganic main group polymers, whereby two alkyl halides are reacted with sodium metal in dry ether solution to form a higher alkane:

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find the mass of 6.022×10^25 oxygen molecules

Posted by Priyatam Shankar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Tarsem Mor 6 years, 7 months ago

3200 g

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Calculate the freezing point of a solution when 3 g of CaCl2 ( M = 111 g mol-1 ) was dissolved in 100 g of water, assuming CaCl2 undergoes complete ionization. ( Kf for water = 1.86 K kg mol-1 )

Posted by Pramod Nanda 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Pragati Gola 6 years, 7 months ago

Tf=?? ∆t=Kf*m*i i for cacl2 is 3 ∆Tf=T°f -Tf , Tf=T°f - ∆Tf , Tf=freezing point of solution

3Thank You

Aman Babu 6 years, 7 months ago

467

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What is the significance of leaching in extraction of aluminium

Posted by Veena Saini 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is aolution

Posted by Devilal Lohar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajay Singh Rajput 6 years, 7 months ago

A solution is a mixture of two or more compound.

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Pls explain "(4n+2)π electrons" rule

Posted by Shobikaa Ravikumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ajay Singh Rajput 6 years, 7 months ago

Hukkle rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic. This rule would come to be known as Hückel's Rule.

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Neeraj Sanyal 6 years, 7 months ago

Hukkle rule

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What is huckel's rule? (In organic chemistry)

Posted by Shobikaa Ravikumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajay Singh Rajput 6 years, 7 months ago

Hukkle's rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic. This rule would come to be known as Hückel's Rule.

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What is volatile and non-volatile solid?

Posted by Goma Devi Dhungel 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajay Singh Rajput 6 years, 7 months ago

Volatile memory is also called as temporary memory as it will hold memory temporarily. Non Volatile Memory : A device which can hold data in it even if it is not connected to any power source is called Non Volatile Memory. The typical examples for Non Volatile Memory are your Hard drives and flash drives.

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Give two importance of raults law.

Posted by Abhishek Patra 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Express raults law for non ideal solution.

Posted by Abhishek Patra 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Rajat Solanki 6 years, 7 months ago

It is of two types i.e positive deviation and negative deviation..

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S Chand book by S.K Jain is preferred for class 12 or not..

Posted by Mahiman Prajapati 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Akash Choudhary Dav Gandhinagar 6 years, 7 months ago

No Comprehensive

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Sinchana Malagond 6 years, 7 months ago

Yes some refer and some don't. You have to be careful while purchasing reference books for class 12

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20g potassium chloride dissolved in 250g water calculate the depression in freezing point.

Posted by Aaradhya Chaudhary 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Sinchana Malagond 6 years, 7 months ago

∆Tf=Kf×m = 1.86×20×1000 _______________ 250×74.5 (39+35.5) = 1.99C The depression in freezing point is 1.99C

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15g of a unknown molecular substance was dissolved in 450g of water .the resulting solution freeze at minus 0.34 degree Celsius . what is the molar mass of the substance

Posted by Rinku Kumari 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Explain swartz reaction

Posted by Priya Yadav 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Vivek Chauhan 6 years, 7 months ago

It is the method of formation of alkyliodide by the halogen exchange...... R-X(=Cl,Br)+AgF2------>R-F+ AgX2....

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The reagent used in the gravimetric analysis of Co^2+ ion is

Posted by Rajpal Ahlawat 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Name of non essential amino acid

Posted by Trishna Sharma 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

When blood cells are kept in pure water what happens to the cell?

Posted by Hemisha Patel 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Rafi Zamir 6 years, 7 months ago

The cells will burst

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Mohammad Shoaib 6 years, 7 months ago

Burst*

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Mohammad Shoaib 6 years, 7 months ago

Endo osmosis takes place cell will swell up and bursy

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Why the initial concentration of product in a chemical reaction is taken to be zero?

Posted by Yogender Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogender Singh 6 years, 7 months ago

Ya I agree with u but acutely we also showing the product at t=0

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Yashu Bhasin 6 years, 7 months ago

It is because the reaction hasn't taken place yet and there is no formation of product at that moment. At time=0 when the required condition for reaction is just provided, only reactant is there so its concentration is taken 1 and concentration of product is 0 because the product has not formed yet.

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How to prepare chemistry fast for board exam

Posted by Ananya Prashar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ashish Shrivas 6 years, 7 months ago

Cover only NCERT

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Sankit Dagar 6 years, 7 months ago

study from begaining no shortcut

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structure of 2 chlorobutane 3,4 dimethylhexane

Posted by Aarti Dhek 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

why is glass considered a super cooled luquid

Posted by Vikul Pal 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogender Singh 6 years, 7 months ago

Bcoz it has ability to flow like liquid so it is called super cooled liquid

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Rishabh Soni 6 years, 7 months ago

Because it is in amorphous form

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How to convert But -1-enl to n-butyl iodide

Posted by Sakshi Kaur ? 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is reverse osmosis

Posted by Pawan Karki 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Hemisha Patel 6 years, 7 months ago

When pressure larger than osmotic pressure is applied on the solution side the solvent molecules in the solution will move to pure solvent this process is called reverse osmosis

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Prakash Kumar 6 years, 7 months ago

The pressure is greater than the osomotic pressure

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Yogita Ingle 6 years, 7 months ago

Reverse osmosis

As the name suggests Reverse Osmosis is just the reverse process of Osmosis. Osmosis can occur naturally whenever there is a difference in concentration between the two solutions. But reverse osmosis takes place only when external energy is applied to the more saline solution.
Application of larger osmotic pressure to the solution side reverses the direction of osmosis.
This phenomenon makes the pure solvent flow out of the solution through the semi permeable
Reverse osmosis is extensively used in desalination of sea.

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Why the % of oxygen decreases on going at high altitude?

Posted by Prashant Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Hritik Kumar 6 years, 7 months ago

Low pressure and gravity force

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Pragati Gola 6 years, 7 months ago

At high altitude--->Low Pressure---->according to henry law ----->Low solubility of O2 in air

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Adarsh Bajpai 6 years, 7 months ago

Due to the pressure gradient

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Differentiate molarity and molality

Posted by Achamma Luke 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Gayatri Devi 6 years, 7 months ago

Molarity .no of moles of solute dissolve in per litre of solution . Molality .no of moles of solutes dissolve in per litre of solvent in kg

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Gursharn Kaur 6 years, 7 months ago

No.of moles/ volume of solution No. Of moles/ mass of solvent

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Formula of gold

Posted by Joni Verma 6 years, 7 months ago

CBSE > Class 12 > Chemistry

4 answers

Yogender Singh 6 years, 7 months ago

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Himanshu Shekhar 6 years, 7 months ago

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Hritik Kumar 6 years, 7 months ago

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Gursharn Kaur 6 years, 7 months ago

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Calculate the electrode potential of a zinc wire dipped in 0.1znso4 Solution at 25c the standard electrode potential of znso4 -0.76v

Posted by Baby Kumari 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

c-c bond is weaker than p-p bond

Posted by Navneet Kumat 6 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Calculate ∆G°and log kc for 2cr+3fe^3+--------->2cr^3+. + 3fe E°celk=0.3v

Posted by Rajat Bisht 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Harshdeep Kaur 6 years, 7 months ago

∆G°=-nFE°cell=-6×96500×0.3= -173700J ∆G°=2.303RT log Kc= 2.303 ×0.0821×298 log Kc -173700/2.303×0.0821×298= log Kc Log Kc=3082.8 Kc= antilog (3082.8) Kc= antilog(3.082×10^3) Kc= 1.205×10^5

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