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

For hydrogen electrode:
{tex}{H^ + } + {e^ - } \to \frac{1}{2}{H_2}{/tex}
Applying Nernst equation:
{tex}E = {E^{0}} - \frac{{0.0591}}{n}\log \frac{1}{{\left[ {{H^ + }} \right]}}{/tex}
{tex} = 0 - \frac{{0.0591}}{1}\log \frac{1}{{{{10}^{ - 10}}}}{/tex} [pH = 10 means {tex}\left[ {{H^ + }} \right]{/tex}
{tex} = {10^{ - 10}}M{/tex}
{tex} = - 0.0591 \times 10 = - 0.591V{/tex}

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Some patient have to undergo dialysis how does it help

Posted by Meena Chopra 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Srishti Choudhary ✍⏳ 6 years, 6 months ago

Mere ques ka bhi ans de de yrr darshu...

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Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 6 months ago

Dialysis is an artificial process used for filtering blood in the human body. although Dialysis is considered as a sustaining measure until the kidney transplant is performed. it's all about introductory part of dialysis. Dialysis functions on the ultrafiltration of fluid through a semipermeable membrane and concept of the dissipation of solutes. for more u can prefer biology book of class 11th unit human physiology.

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Ethyl iodide undergoes SN2 reaction faster than ethyl bromide why?

Posted by Prashantc Rawal 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Rishabh Rathi 6 years, 6 months ago

Iodine is better leaving group.

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Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 6 months ago

Iodide ion is a better leaving grp becoz of its larger size than bromide ion, therefore ethyl iodide undergoes SN2 rxn faster than ethyl bromide.

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Monomer and structure of novolac and buna n

Posted by Mohit Singh 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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Also expain balz-schiemann reacn...

Posted by Srishti Choudhary ✍⏳ 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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Explain gattermann reacn nd sandmeyer's reacn..

Posted by Srishti Choudhary ✍⏳ 6 years, 6 months ago

CBSE > Class 12 > Chemistry

5 answers

Priya Dharshini 6 years, 6 months ago

Wlcm☺

1Thank You

Srishti Choudhary ✍⏳ 6 years, 6 months ago

Okk i understand..

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Srishti Choudhary ✍⏳ 6 years, 6 months ago

Thnks a lot.?

1Thank You

Priya Dharshini 6 years, 6 months ago

In gatermans reaction in place of cucl,cubr,cucn, just write cu.. then all process same... this is easiest method to write these two reaction.... i wrote it nicely but i dont know how to type here and cant send pic also..?

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Priya Dharshini 6 years, 6 months ago

This is sandmayer reaction..Aniline ----> b.d.c by nano2,hcl------->chlorobenzene/bromobenzene/Benzonitrile +2Na by cucl,hcl/cuBr,Hbr/cucn/hcn

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Explain wurtz fitting reaction.

Posted by Srishti Choudhary ✍⏳ 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Srishti Choudhary ✍⏳ 6 years, 6 months ago

Thnks..tell me rest also..plz

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Priya Dharshini 6 years, 6 months ago

Chloro benzene+2Na+CH3CL------->tolune+2NaCl

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Mention on basis of molecular orbital theory electronic configuration

Posted by Omkar Jadhav 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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What is physical chemistry

Posted by Rashmi Thakur 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Rathi 6 years, 6 months ago

It's field of chemistry which deals with physocal properties of chemicals like boiling point, melting point, pH, conductivity, state, reaction feasibility etc.

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What is the relation between the standard EMFof a cell and the equillibrum constant of the cell reaction at 298k

Posted by Vivek Sharma 6 years, 6 months ago

CBSE > Class 12 > Chemistry

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Difference between osmosis and diffusion

Posted by Sanjeev Sanjeev 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Charu Vatsal 6 years, 6 months ago

OMG ? how did you posted such a long table

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Yogita Ingle 6 years, 6 months ago

Osmosis	Diffusion
It is limited only to the liquid medium.	Occurs in all mediums – Solid, Liquid and gas.
Requires a semipermeable membrane.	Do not require a semipermeable membrane.
Depends on the number of solute particles dissolved in the solvent.	Depends on the presence of other particles.
Requires water for the movement of particles.	Do not require water for the movement of particles.
Only the solvent molecules can diffuse.	Both the molecules of solute and solvent can diffuse.
The flow of particles occurs only in one direction.	The flow of particles occurs in all the directions.
The entire process can either be stopped or reversed by applying additional pressure on the solution side.	This process can neither be stopped nor reversed.
Occurs only between similar types of solutions.	Occurs between the similar and dissimilar types of solutions.

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Use molecular orbital theory to explain why He2 molecule does not exists ?

Posted by Omkar Jadhav 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Rishabh Rathi 6 years, 6 months ago

Bond order calculate krne par zero hai.

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Vedika Arya 6 years, 6 months ago

Yaar Questions toh acha kar liya kro

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Another name of 2 - butanol

Posted by Dev Rishubh Agrahari 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Dev Rishubh Agrahari 6 years, 6 months ago

Thanks but it is sec butanol and not sec butane only

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Omkar Jadhav 6 years, 6 months ago

Sec butane

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Compare amylase with amylopectin in terms of constituting structure

Posted by Nargendra Singh 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

Amylose is water soluble linear polymer of {tex}\alpha - {/tex}glucose whereas amylopectin is water insoluble branched chain polymer of {tex}\alpha - {/tex}glucose.

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What are the chief of coaper

Posted by Faiz Malik 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

The main copper sulphide minerals are chalcopyrite (CuFeS2) chalcocite (Cu2S), covellite (CuS), bornite (Cu5FeS4), tetrahedrite ((Cu,Fe)12Sb4S13) and enargite (Cu3AsS4).

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A mixture of chlorobenze and bromobenze is a nearly an ideal solution but a mixture of chloroform and acetone is not ideal explain

Posted by Ajay Sharma 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 6 months ago

Chlorobezene & bromobenzene both have similar structure and polarity. Therefore the various interactions (solute – solute, solvent – solvent & solute – solvent) are same whereas in chloroform and acetone initially there is no hydrogen bonding but after mixing solute solvent interactions (H –bond ) become stronger and solution deviates from ideal behaviour.

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Ethly magnesium bromide to propanal

Posted by Keshav Goel 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Kumar Jha 6 years, 6 months ago

First reacting ethyl magnesium bromide with HCHO then propanol is prepared then oxidation of propanol gives propanal

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What is the role of emulsifying agent in an emullsion?

Posted by Priya Yadav 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Shruti Singh 6 years, 6 months ago

It produces interracial film and stabilise the emulsion

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A 2 Z Topics 6 years, 6 months ago

It stableize the emulsion

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What role does the molecular interaction play in a solution of alcohol and water

Posted by Mikel Nova 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Vishal Mourya 6 years, 6 months ago

IMHB = Integrating intramolecular hydrogen bonding

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Shruti Singh 6 years, 6 months ago

IMHB (explain it)

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How to calculate average rate of areaction

Posted by Meenu Kalonia 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Vishal Mourya 6 years, 6 months ago

A→B Rate of reaction=-∆[A]/∆t = ∆[B]/∆t

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What are Rate determining step How It is helpful in postulating the mechanism of a reaction

Posted by Sanjay Lohani 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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Morality depend on temperature or morality

Posted by Ajay Sharma 6 years, 6 months ago

CBSE > Class 12 > Chemistry

4 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 6 months ago

Aman padh rahe the kya

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Aman Kumar 6 years, 6 months ago

Hmmm

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 6 months ago

Tumne question me molarity ki jagah morality likha hai ... .....aur molarity or molality dono ko same hi bataya hai......BTW molarity depends on temperature

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Aman Kumar 6 years, 6 months ago

Molarity is dependent to Temperature...not molality...???????

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c2h5cooag——c2h5br——>a——agcn——>b,write structure of a and b

Posted by Prathik Angadi 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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the conversion of molecules X to y follows the second order kinetics if the concentration of X is increased to 3 times how will it affect the rate of formation of y

Posted by Abhishek Yadav 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Nishu Sahu 6 years, 6 months ago

The rate becomes 9 times

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Gullu Singh 6 years, 6 months ago

9 times from ncert Questiom

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Explain the coordination number? What is the coordination number of Fe in [Fe(EDTA)]?

Posted by Rajnibadgujar Lovishrathee 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

Coordination number:
The total number of ligands (either neutral molecules or negative ions) that get attached to the central metal atom in the coordination sphere is called the coordination number of the central metal atom. It is also referred to as its ligancy.
For example:, there as six cromate ions attached to Fe in the coordinate sphere. Therefore, the coordination number of Fe is 6

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What is phosgene? How can phosgene be removed?

Posted by Aishwarya Nath 6 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Biswajeet Pillai 6 years, 6 months ago

Chloroform gets oxidised in the prescene of sunlight and form phosgene i.e. COCl2 Which Is Dangerous thats why they used stored in ambered bottle to prevent oxidation. So as to prevent formation of phosgene we use ethanol(C2H5OH) to produce Diethyl Carbonate. Formation Of Phosgene: ChCl3 + O2-----> (air) COCL2 + HCL Prevention: Phosgene + 2C2H5OH------>Diethyl Carbonate{ (C2H5)CO3 + H20 +2HCL

2Thank You

Nasima Khan 6 years, 6 months ago

Urs most welcome yrr

2Thank You

Nasima Khan 6 years, 6 months ago

Chloroform in prescence of light oxidized and form poisonous gas Phosgene it can be remove by adding of ethanol so that diethyl carbonate forms which protect further oxidation if chloroform

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Types of organic reaction and mechanisms

Posted by Samiran Hazarika 6 years, 6 months ago

CBSE > Class 12 > Chemistry