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from where I can get the question papers of class 12 for revesion for jee mains

Posted by [email protected] Cdmk 5 years, 7 months ago

1 answers

Rohit Krishna 5 years, 7 months ago

Either you buy some coaching material from nearby centres for practice or you make use of some guides for class 12 which has previous years' 12th std questions in it.Else,you search the internet for previous question papers and select 12th std questions from it for practice so that it'd be helpful for your 11th also as you read through the questions ay least once for selection.

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5.85 g of Nacl is dissolved in 90 g of water.what is the mole fraction of Nacl?

Posted by Gayatri Khilla 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ankan Rastogi 5 years, 7 months ago

Very nice

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Yogita Ingle 5 years, 7 months ago

Moles = Weight / Molar mass

Moles of NaCl = 5.85 g / (58.5 g/mol) = 0.1 mole
Moles of H₂O = 90 g / (18 g/mol) = 5.0 mole

Mole fraction of NaCl = (Moles of NaCl) / (Total number of moles in solution)
= (Moles of NaCl) / (Moles of NaCl + Moles of H₂O)
= 0.1 mole / (0.1 mole + 5.0 mole)
= 0.1 / 5.1
= 1 / 51

Mole fraction of NaCl in solution is 1 / 51

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What is bayer villiger oxidation reaction

Posted by Anurag Surothiya 4 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 7 months ago

The Baeyer–Villiger oxidation is an organic reaction that forms an ester from a ketone or a lactone from a cyclic ketone, using peroxyacids or peroxides as the oxidant. The reaction is named after Adolf von Baeyer and Victor Villiger who first reported the reaction in 1899.

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I want the best you tube channel for chemistry for cbse board

Posted by Sachin Roy 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Nidhi Rawat 5 years, 7 months ago

You can search Sandeep natyuial classes this is best for chemistry students

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What is cell potential and what is is electrode potential and why we called electrode potential as standard reduction potential

Posted by Abhi Maurya 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

define solution

Posted by Mahesh Choudhary 5 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Aditya Singh 5 years, 7 months ago

It is a homogeneous mixture of two or more compounds and cannot be separated by simple method solute is present in less amount and solvent in larger amount eg.ethanol and water 20%ethanol and 80%water(solvent)

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Vivek Chaurasia 5 years, 7 months ago

A mixture of solute + solvent =solution Solvent has higher concentration Solute has lower concentration..

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Mahesh Choudhary 5 years, 7 months ago

define solution

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Write an increasing order of boiling point of isomeric haloalkanes

Posted by Roziine Jasmine 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ankan Rastogi 5 years, 7 months ago

Good

1Thank You

? ? 5 years, 7 months ago

Boiling point depend on branching therefore order will be n-alkane> iso- >neo-

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What is meant by reducing sugars?

Posted by Shathick Shaju 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Shikha Jakhar 5 years, 7 months ago

Reducing sugar are monosaccharides that reduces Tollen's reagent and Fehling solution...

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Yogita Ingle 5 years, 7 months ago

A reducing sugar is any sugar that is capable of acting as a reducingagent because it has a free aldehyde group or a free ketone group. All monosaccharides are reducing sugars.

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Write the mathematical relationship between Gibbis energy and cell potential

Posted by Nikita Tamang 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhi Maurya 5 years, 7 months ago

Delta G=-nfECell (unstandard)

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Ncert exercise 2.16

Posted by Prashant Yadav 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Aditya Singh 5 years, 7 months ago

Calculate the no of moles for both and then find their mole fraction of both the compounds and multiply both separately by the given pressure

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ANSWER

What is sn1 abd an2 mechanusm

Posted by Ayush Singh 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is basic structuredifference bt. Starch and cellulose

Posted by Shubham Sharma 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

? ? 5 years, 7 months ago

Starch is polymer of alpha glucose, is branched with alpha 1,4 and 1,6 linkage Cellulose is a polymer of beta glucose and is unbranched with beta 1,2 linkage

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Atoms A, B, C and D are present at corners , face centres , body centres and edge centres respectively in a cube unit cell. If the atoms touching one of the rectangular planes of symmetry and one of the 4- fold axis are removed, then formula of compound is

Posted by Vaishali Chaudhary 5 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Chapter 2 solution class12th

Posted by Vishali Sharma 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Crystalline csv r has a BCC structure calculate the unit cell edge length if the density of csb Crystal is 4.24 gram per centimetre cube atomic mass of CS equal to 133 and PR is 80 so calculate this answer

Posted by Madhu Singh 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Crystalline has BCC structure calculate the unit cell edge length if the density of CS blacklisted is 4.24 gram centimetre cube atomic mass given a CS ka 133 and Bihar ka 80

Posted by Madhu Singh 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is colloidon

Posted by Avesh Khan 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 7 months ago

Collodion is four percent solution of nitro cellulose in a mixture of alcohol and ether. It is used for coating things in surgery and holding the dressings in place. It is flammable and syrupy solution. It may be elastic or in elastic. It may also be used in photographic films.

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Rohit Krishna 5 years, 7 months ago

Collodion is a solution of nitrocellulose in a mixture of alcohol and ether.

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Why H-bond always formed between Hydrogen and florine, H-O, H-N

Posted by Akash Singh 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

? ? 5 years, 7 months ago

It is because of small size and high electronegativity

1Thank You

Meghna Thapar 5 years, 7 months ago

Hydrogen bonding is a very special intermolecular force that occurs in polar molecules when a hydrogen atom is bonded to a highly electronegative atom. Thus the effect of hydrogen bonds can be very large. They are so strong that they seem like weak covalent bonds. Thus, the name hydrogen bond. Hydrogen forms only one hydrogen bond with flourine in HF because flourine is more electronegative and its electrons are more stabilized and not ready to be donated to some accepter. Each of the hydrogen atoms can be hydrogen bond acceptors; each of the lone pairs on the oxygen can be donors.

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1 bar is equal to how many pascal

Posted by Fathima K.N 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Jass . 5 years, 7 months ago

1 bar = 100000 Pascals

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Is radius ratio is in syllabus ??? #solid state

Posted by Devil ? 5 years, 7 months ago

CBSE > Class 12 > Chemistry

5 answers

Devil ? 5 years, 7 months ago

Solid state is in syllabus full confirm h .. that's why on this app too this chapter is now added ..

1Thank You

Robinpreet Kaur 5 years, 7 months ago

Solid state chapter is not in syllabus in 2020 please check on google

1Thank You

Sachin Baliyan 5 years, 7 months ago

Yes

1Thank You

Rajesh Singh 5 years, 7 months ago

Yes

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Anushka Shrivastava 5 years, 7 months ago

Yesss

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ANSWER

Electrophilic Substitution Reaction

Posted by Amit Rana 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 7 months ago

An electrophilic substitution reaction is a chemical reaction in which the functional group attached to a compound is replaced by an electrophile. The displaced functional group is typically a hydrogen atom. Electrophilic substitution reactions generally proceed via a three-step mechanism that involves the following steps.

The generation of an electrophile
The formation of a carbocation (which is an intermediate)
The removal of a proton from the intermediate

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Classify the following solids in different categories based on the nature of intermolecular forces operating them Pottassium sulphate,tin,benzene,urea,ammonia,wwater,zinc sulphide,graphite,rubidium,argon,silicon carbide.

Posted by Gulshan Baghel 5 years, 7 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Define ebullioscopic constant or molal elevation constant

Posted by Nimisha Singh Singh 5 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Rahul Mehra 5 years, 7 months ago

It is defined as the elevation in boiling point of solution .as vapour pressure of solution is less than the pure solvent.

1Thank You

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which process used to make dialysisi faster

Posted by Vipul Mumbaikar 5 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

? ? 5 years, 7 months ago

Or rather application of electrodes

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? ? 5 years, 7 months ago

Ultrafiltration.....may be

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Which refrence book is best for chemistry...please bataoo koii..

Posted by Vivek Chaurasia 5 years, 7 months ago

CBSE > Class 12 > Chemistry

3 answers

Aditya Singh 5 years, 7 months ago

Modern ABC for chemistry and biology H C Verma physics

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? ? 5 years, 7 months ago

Decide your priority first.....if u have to mainly focus on boards then go for oswaal or pradeep but if you are preparing for entrance then go for books with previous year question or any coaching study material....it actually helps

3Thank You

Rohit Krishna 5 years, 7 months ago

Oswaal,Pradeep,HC Verma

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24 gram of non volatile non electro side solute in added to so gram of water the boiling of resulting solution is 370 3.55 ke calculate the measure mass of the solute. Pure water is 373 Kelvin and KB for water it 0.52 kg Mall solution

Posted by Samarth Lakkar 5 years, 7 months ago

CBSE > Class 12 > Chemistry