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

Grignard reagent is an orgometallic chemical reaction in which alkyl, vinyl or aryl magnesium halides add to a carbonyl group in an aldehyde or ketone. This reaction is important tool for formation of carbon - carbon bonds.

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Mansee Saini 7 years, 7 months ago

Mgx

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Unit of packing efficiency

Posted by Somnath Pal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Kanishka Saxena 7 years, 7 months ago

Packing efficiency is unitless..

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Shrejal Gupta 7 years, 7 months ago

It has no units

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class 11 ncert pg no 37 at a given temperature, intensity of radiation emitted increases with increase in wavelength, reaches a maximum due to maximum value at a given wavelength and then starts decreasing with further decrease in wavelength. Is this statement correct? ?

Posted by Harsh Badgal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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A solution containing 4.2g of an organic compound in 50g of acetone shows an elevation of boiling point by 1.8K.determine the molar mass of the organic compound.Kb of acetone is equal to 1.71K kg per mol

Posted by Ponso Narzary 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Explain elevation in boiling point .

Posted by Aman Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Dipanshu Bokade 7 years, 7 months ago

Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.

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Komal Parshwal 7 years, 7 months ago

This property state that when non volatile solute to a solvent its boiling point increase

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What is galvanic cell?

Posted by Rimpi Roy 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Shweta Arya 7 years, 7 months ago

A device in which the redox reaction is carried out indirectly and the decrease in free energy appears at the electrical energy is known as galvanic cell.

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What's the difference between galvanic and Daniel cell?

Posted by Naushin Naaz 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Dipanshu Bokade 7 years, 7 months ago

A galvanic cell is also referred to as a voltaic cell or Daniell cell. The common household battery is an example of a galvanic cell. The flow of electrons from one chemical reaction to another happens through an outside circuit resulting in current.

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What's the difference between galvanic cell and daniel cell?

Posted by Mohit Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Shweta Arya 7 years, 7 months ago

Galvanic cells are those cells in which the redox reaction is carried out indirectly and the decrease in free energy appears at the electrical energy While Daniel cell is modified electrochemical cell in which Zn- CuSo4 reaction takes place

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I hv no questions about the topic but about the app.....generally VN I want to see any table.....I can't see it properly... Bcoz....it is unable to slide....hence I can't see vt is in dt column of the table.....so plz help me...bcoz there r a lots of table in chemistry portion

Posted by Anne Swift 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Anne Swift 7 years, 7 months ago

Dt is vt I'm asking

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Princesses Kaur 7 years, 7 months ago

How l can help u

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Why does end centred not a possible variation of cubic crystal lattice system?

Posted by Mansi Jaiswal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Rupesh Kumar 7 years, 7 months ago

Because in end centred spheres are present at opposite two faces.But in cubic crystal lattice they are at corners.Presence of spheres are additional in end centred.It may be relate to the face centre with loss spheres

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Definition of Henry laws constant

Posted by Samir Baidya 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Aneesh Singh Thakur 7 years, 7 months ago

At constant temperature the solubility is directly proportional to the partial pressure . Solubility proportional to the pressure

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Can anyone tell me how to calculate log value by taking example

Posted by Alok Suryavanshi 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Saloni S 7 years, 7 months ago

Calculate the value of flowing (1)log 25.7 Ans- see the log table Go the no.25and see the value of 7 firstly ,the value is 4099 .this log value is lie b/w 10-100 so put the 1 before the value which we find in log table .so the Ans of this question.is 1.4099 (2) log2.3 Ans.- go to he no.23 and see the value of 0 in log table(because after the 3 there in no value so we assume that the 0 is behind the 3).this log value is lieb/w 0-10 .so put the zero before the value which we find in log table . The and is.3617 (3) log71.24 Ans. Go to log table no.71 and see the value of 2 , the value comes 8525 then see the value of 4 in log table the value comes 2 .Then add the both values 8525+2=8527 The log value Ia Lie b/w10-100 so put the one before calculated value .The Ans is 1.8527 Remember few things 0-10=0 10-100=1 100-1000=2

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Boiling point of 0.01M AB2 which is 10% dissociated in aqueous medium kb of h2O = 0.52 as A^+2 and B–

Posted by Irappa Irappa 7 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

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The function of alcl 3 in federal caraft reaction

Posted by Avinash Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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A solution containing 10g/litre of sucrose has an osmotic pressure of 0.66 atm at 273k. Calculate the value of the constant R

Posted by Priyanshu Gupta 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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For the reaction A+B↔C+D.The degree of dissociation would be?

Posted by Rishabh Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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when kcl is kept in vapours of k it becomes reddish explain why

Posted by Gurleen Kaur 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Adil Adil 7 years, 7 months ago

Because chlorine has to capacity to to react with any hydrogen as they have a sharing electron and K is becoming their original colour

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elevation in boiling point of 1M KCl is nearly double than that of 1M sugar solution

Posted by Sukhman Dhillon 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Saloni S 7 years, 7 months ago

Because of degree of dissociation

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Refractive index of solid have same value along all direction .what is nature of solid?

Posted by Gagan Chohan 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Swapnil Jana 7 years, 7 months ago

The solid is isotropic in nature.........generally amorphous

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What effect of temperature on the solubility of gas?

Posted by Krish Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Princesses Kaur 7 years, 7 months ago

Temperature increase then solubility decrease

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Shubham Chhikara 7 years, 7 months ago

Temp. is inversely proportional to the solubility as dissolution of a gas in liquid is an exothermic process.

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Given that temperature coefficient of saponification of ethyl acetate by sodium hydroxide is 1.75. Calculate activation energy of the reaction.

Posted by Punita Pawaria 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Boiling point elevation constant for a solavent

Posted by Mahendra Mahendra 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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ANSWER

Why are the glass called super cooled liquide

Posted by Aman Kushwah 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Vishal Kumar 7 years, 7 months ago

Glass is called super cooled liquid because glass is the example of amorphous solid.Amorphous solid posses some characteristics like a liquid.

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Saurav Sharma 7 years, 7 months ago

Because it has property to flow at a range of temperature

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The method of galvanic cell

Posted by Priyanshu Rout 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Dipanshu Bokade 7 years, 7 months ago

A galvanic cell is a spontaneous electrochemical cell that produces electricity by a spontaneous redox reaction. ... Justification: In this activity, analogy method is used to facilitate students' in understanding the concept of spontaneous and non-spontaneous reaction in electrochemical cell.

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The method of galvanic

Posted by Priyanshu Rout 7 years, 7 months ago

CBSE > Class 12 > Chemistry