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

Bs mere experiment se question pooche the external project ka toh koi role hi ni tha...aur pta h kai logo ka to experiment copy to dekha hi ni aur bs ek questn me nipta diya hahaha...

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Divya Sen 8 years, 1 month ago

Nothing yr it was just ok...experiments toh external aaya nhi tha tbhi hmlogo ne kr liya tha upr se maine to ek experiment kiya b ni bs readings likh diya yd kr k gye the sb aur phir viva me 4-5 questn pooche mujhse external ne maine 2-3 ans diye thik hi tha infact achha tha?

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Aisha Grewal 8 years, 1 month ago

How's that

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Divya Sen 8 years, 1 month ago

Yes you are absolutely correct sweety...what's there to say sorry yr...and thnx for the answer...mine chemistry practical is on day after tomorrow...today it was physics.

1Thank You

Aisha Grewal 8 years, 1 month ago

Yes. When applied potential is greater than the potential of cell.. Maybe... Sorry I m not so sure.. Bt it is sure that it can act as electrolytic cell... As this question was asked to me in viva

1Thank You

ANSWER

What is fcc What is bcc

Posted by Joy Ngam 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Payal Kashyap 8 years, 1 month ago

Fcc is face centered cubic unit cell.its co ordination no is 12.bcc is body centered cubic unit cell.its co ordination no is 8

1Thank You

Vineet Kumar Gupta 8 years, 1 month ago

Face centre lattice and Body centre latticr

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ANSWER

Pls anyonne tell the viva questions for chemistry. And my project is from colligative property

Posted by Ritu Gupta 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Love Sidhu 8 years, 1 month ago

What is bayer's reagent?,what is a parallax card,titration.,titrate and titrant

1Thank You

Ritu Gupta 8 years, 1 month ago

Please tell

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ANSWER

Kisi ka hua h kya chem practical

Posted by Hina Siddiqui 8 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Vidhi Rawat 8 years, 1 month ago

Yes mam asked name reaction

1Thank You

Sabeen Mustafa 8 years, 1 month ago

Yes she asked principle of chromatography and d-d transition and group reagents from practicals

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Rohan Rai 8 years, 1 month ago

2Thank You

Hina Siddiqui 8 years, 1 month ago

Viva ques bta do

2Thank You

ANSWER

What is h2o

Posted by Harshit Shrivastav 8 years, 1 month ago

CBSE > Class 12 > Chemistry

7 answers

Vineet Kumar Gupta 8 years, 1 month ago

Its *Mr Vineet sweety i dont like being called anything exception vineet . please

0Thank You

Aisha Grewal 8 years, 1 month ago

Okay oookkk I understand

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Aisha Grewal 8 years, 1 month ago

Y oxidane kya h Mr. UP

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Vineet Kumar Gupta 8 years, 1 month ago

OXIDANE is H2O

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Aisha Grewal 8 years, 1 month ago

Hahahaha ????

1Thank You

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

There exist several techniques for generating approximate solutions, however. In the important method known as perturbation theory, one uses the analytic result for a simple quantum mechanical model to generate a result for a more complicated model that is related to the simpler model by (for one example) the addition of a weak potential energy. Another method is the "semi-classical equation of motion" approach, which applies to systems for which quantum mechanics produces only weak (small) deviations from classical behavior. These deviations can then be computed based on the classical motion. This approach is particularly important in the field of quantum chaos..........{but H2O is water}...

1Thank You

Aisha Grewal 8 years, 1 month ago

OMG..... Albert Einstein....... It is water

2Thank You

ANSWER

Medicine used for treatment of typhoid fever...??.....second book ke first page pe de rakha hai ...dekh ke batana jera....

Posted by Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

CBSE > Class 12 > Chemistry

6 answers

Rida Khan 8 years, 1 month ago

Pshyco

1Thank You

Pranav Rastogi 8 years, 1 month ago

No doubt definitely mad...

1Thank You

Candidate Yaduvanshi 8 years, 1 month ago

No those who write the ques

1Thank You

Aisha Grewal 8 years, 1 month ago

Kon mmmmm

1Thank You

Candidate Yaduvanshi 8 years, 1 month ago

You are mad

1Thank You

Aisha Grewal 8 years, 1 month ago

Mst joke h

2Thank You

ANSWER

Is H3PO4 a better oxidizing agent than H2SO4?and why?

Posted by Pranav Rastogi 8 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Love Sidhu 8 years, 1 month ago

Read the ques. No. 2 chaptet 10 ncert

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Love Sidhu 8 years, 1 month ago

Because it is non oxidising agent

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Pranav Rastogi 8 years, 1 month ago

But why..

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Love Sidhu 8 years, 1 month ago

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ANSWER

Group 15 kisiko ata h pleas help me friends

Posted by Shivanshu Yadav 8 years, 1 month ago

CBSE > Class 12 > Chemistry

11 answers

Shivanshu Yadav 8 years, 1 month ago

Tumbhi n ??

1Thank You

Shivanshu Yadav 8 years, 1 month ago

??????

1Thank You

Aisha Grewal 8 years, 1 month ago

Dictionary achi vali l lo na fir.. Kya 200-300 rupees bchate gum rhe ho???

1Thank You

Shivanshu Yadav 8 years, 1 month ago

Meri dictionary m impossibal nam k word nhi h

1Thank You

Aisha Grewal 8 years, 1 month ago

Purraa chapter???is p to impossible h

1Thank You

Shivanshu Yadav 8 years, 1 month ago

Pure chapter pad liya but confused ho gya hu bs koi pura chapter ek bar smja de

1Thank You

Gaurav Mishra 8 years, 1 month ago

Are questions to batao

1Thank You

Pranav Rastogi 8 years, 1 month ago

What is the question?

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Shweta Kashyap 8 years, 1 month ago

Mujhe aata hai bilkul ache se pucho kya puchna hai

2Thank You

Aisha Grewal 8 years, 1 month ago

Question kya h

2Thank You

Aisha Grewal 8 years, 1 month ago

Really... Oooooo

1Thank You

ANSWER

What happens to the molar conductivity of weak eletrolyte on decreasing the concentration?

Posted by Sagar Hussen 8 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why according to saytzeff rule the more alkylated alone is proffered??

Posted by Preksha Sharma 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Mishra 8 years, 1 month ago

More symmetrical products are preferred.

1Thank You

ANSWER

Aryl halides do not undergo nucleophilic substitution reaction

Posted by Milind Agarwal 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Mishra 8 years, 1 month ago

1. Due to resonance bond between C & CIgets partially double bond appearance,which get stronger. 2. Ar-CI is sp^2 hybridisation which is more electronegatine and pulls electron towards itself. 3. Due to cloud of electron nucleophile feels repulsion.

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ANSWER

What is the structure of chloroxylenol and terpeneol?

Posted by Aparna Sharma 8 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Glucose is monosaccheride or disaccheride

Posted by Harshit Shrivastav 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

Mono saccheride

5Thank You

ANSWER

How is wrought iron different from steel?

Posted by Aayush Kesarwani 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Sakshi Kumari 8 years, 1 month ago

Sry niand nhi nickel

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Sakshi Kumari 8 years, 1 month ago

Wrought iron is the purest form of iron and contains carbon and other impurities not more than 0.5%. steel contains 0.5% to 1.5% carbon along with small amount of other elements such as Mn,Cr ,Niand other impurities.

1Thank You

ANSWER

What is meant by acids

Posted by Ashwani Om 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

A substace which produce H+in aqueous state

2Thank You

ANSWER

Organic formula of benzene

Posted by Anand Singh 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

C6H6

2Thank You

ANSWER

Write chemical reaction for the preparation of chloroform in the laboratory.

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Pranav Rastogi 8 years, 1 month ago

It can be prepared using Haloform reaction. Reagent: Halogen+NaOH/KOH+HEAT OR NaOX or KOX.....X=halogen Reaction: CH3CH2OH+4×Cl2+6×NaOH--->CHCl3+HCOONa+5×H2O+5×NaCl

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ANSWER

Why are haloarenes less reactive than haloalkanes?

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Jashan Deep 8 years, 1 month ago

So thats why these are less reactive

1Thank You

Jashan Deep 8 years, 1 month ago

Haloareans have rasonence effect which dec. The acidic strength

1Thank You

Prashant Tripathi 8 years, 1 month ago

They got stable due to resonance

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Payal Kashyap 8 years, 1 month ago

Haloarene is less reactive than haloalkane because Haloarene have partial double bond character so its bond is strong and difficult to break

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ANSWER

C-Cl bond length in chlorobenzene is shorter than the same bond present in methyl chloride. Explain.

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

Chlprobenzene have partial double bond character due to resonance due to which it has shorter bond than methyl chloride

3Thank You

ANSWER

What are ambident nucleophiles? Give an example.

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Vineet Kumar Gupta 8 years, 1 month ago

adding to the previous answer ambient nucleophiles can have only on3 point of attachment at a time

1Thank You

Payal Kashyap 8 years, 1 month ago

The species posses two nucleophilic centre is known as ambident species.foe eg cyanides.cyanide can link through carbon or nitrogen.when it link through carbon cyanide is formed and when it link through nitrogen isocyanide is formed

3Thank You

ANSWER

Mechanism followed by hydration SN1 or SN2

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Pranav Rastogi 8 years, 1 month ago

Direct hydration by H2O involves formation of carbocation .Hence,SN1 mechanism.

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ANSWER

Although chlorine is an EWG group yet it is O and P directing in electrophilic aromatic substitution. Explain why it is so?

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Gaurav Mishra 8 years, 1 month ago

And resonance effect is more powerful than inductive effect therefore it become ortho and para directing.

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Payal Kashyap 8 years, 1 month ago

Chlorine withdraws electronthrough inductive effect and releases electron through resonance.through inductive effect ,chlorine destabilize the intermediate carbocation formed during the electrophilic substitution .through resonance ,halogen tend to stablise the carbocation and effect is more pronounced at ortho and para position

4Thank You

ANSWER

Nomen clature me chlorine or triple bond me se kise jayada priority milegi

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Payal Kashyap 8 years, 1 month ago

Triple bond ko

3Thank You

Sheetal Wankhede 8 years, 1 month ago

Help me Guy's

1Thank You

Sheetal Wankhede 8 years, 1 month ago

Halogen group ko double and triple bond se kam priority milati he kya???

1Thank You

ANSWER

What is a racemic mixture? Give an example.

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

l and d form compound in equal proportion form racemic mixture.and racemic mixture is optically inactive

3Thank You

ANSWER

Why do haloalkanes dissolve in organic solvents?

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

Halo alkane dissolve in organic solvent because force of interaction betn haloalkane and organic solvent is larger than force of interaction betn organic solvent itself

4Thank You

ANSWER

What happens when chloromethane is react . 1} with KCN 2} with AgCN

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Kajal Kumari 8 years, 1 month ago

1CH3-CN 2CH3-NC

3Thank You

ANSWER

How to prepare colloidal solution of starch and water ?

Posted by Rishi Mishra 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Payal Kashyap 8 years, 1 month ago

Colloidal solution of starch and water is prepared by direct mixing both.because starch is lyophilic colloid

2Thank You

ANSWER

Phenol do not give protonation reaction readily

Posted by Ayush Mis 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Mis 8 years, 1 month ago

In phenol the lone pair of electron on the oxygen atom are delocalisd over the benzene ring due to resonence and hence ae not easily available for protonation to describe oHbond thus making protonation difficult

3Thank You

ANSWER

What is Chromyl chloride test

Posted by Neha Sahu 8 years, 1 month ago

CBSE > Class 12 > Chemistry