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

Aryl halides : In organic chemistry, an aryl halide (also known as haloarene or halogenoarene) is an aromatic compound in which one or more hydrogen atoms directly bonded to an aromatic ring are replaced by a halide.

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Aman Kumar 6 years, 6 months ago

An aryl halide is an aromatic compound in which one or more hydrogen atoms directly bonded to an aromatic ring are replaced by a halide.

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what happens to the heat when acitone and aniline is mixed up

Posted by Abi Jo 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Write one reaction each to distinguish between ethanol and phenol and n propyl and iso propyl

Posted by Rozlin Kabir 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

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There is a topic in chemical kinetics (pseudo first order reaction),why the name of these topic is pseudo first order reaction, pseudo second order why not?

Posted by Vivek Kumar 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

some rxn are first oder w. r. t. 2 different reactant r=k[A]'[B] '... however if one of the reactant is the solvent then there is always very little change in its concentration and it is practically remains constant during the course of rxn. r=kο[A]' where kο=k[B] ... this now behaves as first oder rcn, such rxn are known as pseudo first oder rcn.

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What is the difference between galvanic cell and elctrolytic cell

Posted by Piyush Kishore 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 6 months ago

Galvanic Cells	Electrolytic Cells
Spontaneous redox reactions convert the chemical energy to an electric energy	Non-spontaneous redox reactions convert the electric energy to a chemical energy
Electric energy is generated by redox reactions	Electric energy brings about the chemical reaction with the help of an external source
The cathode is the positive electrode and anode is the negative electrode	The anode is the positive electrode and cathode is the negative electrode
The process of oxidation takes place at the anode and the reduction process occurs at the cathode	Here, the oxidation process occurs at the cathode while the reduction process takes place at the anode
Half cells are set up in different containers and are connected through salt bridges	Electrodes are kept in the same container in a molten or solution electrolyte
Application lies in Batteries	Application lies in purifying copper and electroplating

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Aayushi Singh 6 years, 6 months ago

Galvanic cell derives electricity from redox reaction wether electrolytic cell derives non spontaneous redox reaction from electricity

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At 300℃ the thermal decomposition of HI is found to be 20% what will be the equilibrium concentration of H2and I2 in the system . If the equilibrium concentration of HI is 0.96 mol /l H2 +I2 gives HI

Posted by Ishika Gupta 6 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

how we find the solution of previous years paper of mycbseguide of chemistry

Posted by Kuldeep Singh 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 6 months ago

Check last year papers here : <a href="https://mycbseguide.com/cbse-question-papers.html">https://mycbseguide.com/cbse-question-papers.html</a>

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What are the limitations of Raoults Law?

Posted by Amisha Shrivastava 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Aman Kumar 6 years, 6 months ago

Limitations : 1.Raoult's law is applicable only to very dilute solutions. Raoult's law is applicable to solutions containing non-volatile solute only. 2.Raoult's law is not applicable to solutes which dissociate or associate in the particular solution.

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Yogita Ingle 6 years, 6 months ago

Limitation of Raoult 's Law :
1. In case of the solution of an electrolyte this law is not applicable .
2. Raoult 's law is not applicable in case of volatile solvent .
3. Raoult 's law is applicable only in case of an ideal sollution

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ANSWER

enot cell for the given redos rxn is2.71v . Mg +Cu 2positive(0.01M) gives Mg 2positive(0.001M) + cu . calculate cell for the rxn

Posted by Adarsh Rathod 6 years, 6 months ago

CBSE > Class 12 > Chemistry

5 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

arrey mamta jub zyada baate hone lagti hai toh post hua question disappear ho jata hai. . ? ? ? Jadu boltey hai isey... ? ? ?

3Thank You

Nancy Rajput 6 years, 6 months ago

using nerenest equation from electrochemistry

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

Aman where your answer bas gone the question also disappeared

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Aman Kumar 6 years, 6 months ago

Nice answer

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Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

First write the eq. Mg +Cu2+ ➡️Mg2+ +Cu... from this eq. we get to know the no. of e- transfer which is 2..now use the formula for finding Ecell so here we go. Ecell=E°cell - 0.059/n log[Mg2+] /[Cu2+] now put all the value in the eq. Ecell =2.71 - 0.059/2 log 0.001/0.01 solve this u well get ur answer 2.7395 V. hope it help

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I want the notes of GOC chapter organic

Posted by Jyoti Yadav 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Vivek Kumar 6 years, 6 months ago

What do you mean about goc chapter?

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

You can search on google you will get them

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ANSWER

What is "copper matte"?

Posted by Kavita Bajpeyi 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 6 months ago

Copper Matte is the mixture of copper sulphide and some iron sulphide. Matte is the phase where copper is extracted prior to the final reduction process converting it to crude copper .
The composition of copper matte is:-
80– 95 % coppers sulphide,
5 – 17 % metallic copper, Fe-Co alloys, metallic silver, galena, Pb-Ag alloys, Pb-Ni alloys, Pb-Cu alloys and arsenides.

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Kavita Bajpeyi 6 years, 6 months ago

What is" copper matte "?

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find 2/3life of first order reaction where k =5*10^-14s

Posted by Akshay Tyagi 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajit Sharma 6 years, 6 months ago

Let the initial concentration be a₀

2/3 life means the initial concentration becomes (2/3) of a₀. ( As in half life, the initial concentration becomes half of the initial concentration ).

Therefore concentration left a_{0 -}(2a₀/3) =a_0/3

We have t_2/3 = 2.303/( 5 x 10^-14) log(a₀/a₀/3)

= 4.606 x 10¹³ x log 3

= 2.1976 x 10¹³ s

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I have to draw a chart which topic should i take. It must be relevent to the syllabus. Answer SOON PLZZZZZZZZZZ

Posted by Gursharn Kaur 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

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

You can google it ,you will find a better answer there

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How do conductivity and molar conductivity vary with concentration

Posted by Arun Kumar 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajit Sharma 6 years, 6 months ago

Molar conductivity increases with increase in dilution i.e. decrease in concentration. On the other hand conductivity decreases with dilution i.e. decrease in concentration.

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How to find the value of limiting molar conductivity?

Posted by Yamima Rai 6 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Yamima Rai 6 years, 6 months ago

Thank you..

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Karan Chauhan 6 years, 6 months ago

Using by kholraush lae

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Jasnoor Grewal 6 years, 6 months ago

Use kohlraush law...

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ANSWER

Using IUPAC norms write formula for the Tetrabromidocuprate (ll).

Posted by Entertain Zone 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhinav Singh 6 years, 6 months ago

[Cu(Br)4]2-

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What is meant by term double salt

Posted by Entertain Zone 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

When two salts in stoichiometric ratio are crystallised together from their saturated solution they are called double salts.

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Nitric oxide NO, reacts with oxygen to produce nitrogen dioxide 2NO(g)+O2(g)→2NO2(g) The rate law for this reaction is : Rate=k[NO]2[O2] Propose a mechanism for the reaction.

Posted by Himanshu Gupta 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Nancy Rajput 6 years, 6 months ago

sn2

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Why glycol and water mixture used in car radiater

Posted by Shivam Sharma 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Pragati Gola 6 years, 6 months ago

Anti frezzing

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Why do gases tends to be less soluble in liquid as the temperature is raised

Posted by Shivam Sharma 6 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Gursharn Kaur 6 years, 6 months ago

As the temperature rises the kinetic energy increases which makes the movement of gas particles random which decreases its solubility in liquids

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Pankaj Chadda 6 years, 6 months ago

As the temperature rises the particles moves randomly fast because of which solublity gets decrease.

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What is meant by the term coordination number what

Posted by Anjani Thakur 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Pankaj Chadda 6 years, 6 months ago

Number of neighbouring particles of a particular particle.

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What is meant by the term coordination number

Posted by Anjani Thakur 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Entertain Zone 6 years, 6 months ago

The number of coordinate bonds formed with the central metal atom/ ion by the ligands

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what is the product when P4O6 add with PCl5

Posted by Nancy Rajput 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhinav Singh 6 years, 6 months ago

May be POCl3

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Explain machnism of Reimer Tiemann reaction?

Posted by Sandeep Kumar 6 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Nancy Rajput 6 years, 6 months ago

When phenols are treated with chloroform in the presence of sodium hydroxide, an aldehyde group (-CHO) is introduced at the ortho position of benzene ring leading to the formation of o-hydroxybenzaldehyde. This reaction is popularly known as Reimer Tiemann reaction.

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Why we read haloalkane

Posted by Adarsh Raja 6 years, 6 months ago

CBSE > Class 12 > Chemistry

6 answers

Priya Dharshini ? 6 years, 6 months ago

For truth.... u need to read it to get marks, if u want to become chemical engineer,bsc then u need to know all these...

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Aman Kumar 6 years, 6 months ago

Yah, read the introduction of haloalkane....u will get to know about the reason...?

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Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

? ? what a logic....?? we study haloalkane so that we can their different uses in industrial as well as in various pharmaceutical company.... for more details introduction part padh lo... ? ?

1Thank You

Ayush Yadav 6 years, 6 months ago

Because you can't eat it so you have to read it

2Thank You

Aman Kumar 6 years, 6 months ago

Because this is in our syllabus

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Laksh Chauhan 6 years, 6 months ago

Because it contains halogen and alkane

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ANSWER

Solution of a solid in a liquid involves dynamic equilibrium.explain

Posted by Uzer Khatri 6 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Aman Kumar 6 years, 6 months ago

Hope this helps

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Aman Kumar 6 years, 6 months ago

When rate of dissolution and rate of crystallisation gets equal/same , at that time the dynamic equilibrium attained........This is what we know about solids in liquids solution...

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Aman Kumar 6 years, 6 months ago

Yah, when solids dissolves in a liquid ,a dynamic equilibrium attained. When some amount of solid solute is dissolves in liquid solvent, it get dissolve in liquid solvent and the conc. of solid solute gets increases in solvent, this process is called Dissolution...when dissolution takes place, the dissolved solute particles get collides with the other solute particles and due to this some amount of solute get settled down ,this process is called Crystallisation......

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