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

Whats your problem ....meri marzi....if i am not saying anything to you it does not mean that you can say anything ....MERI MARZI.... Samajh aaya...?????

2Thank You

Tamanna Sharma 6 years, 1 month ago

Please yrr ye roses type mat karo it's really irritating,,,please humble request

2Thank You

Tamanna Sharma 6 years, 1 month ago

Prostaglandins ke effect ko kam karne ke liye and takee blood clotting rok sake and prevent from heart attack

1Thank You

ANSWER

Is there only lead battery in syllabus, others nahi hai kya??

Posted by Rajat Barwar 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Chirag Vasantani 6 years, 1 month ago

Hai

0Thank You

ANSWER

Between Sodium hydrogen carbonate and magnesium Hydroxide which is a better ant acid and why?

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Nishant Sharma 6 years, 1 month ago

0Thank You

Arsheen Kaur 6 years, 1 month ago

Mg(OH)2

0Thank You

Varun Chawla 6 years, 1 month ago

magnesium hydroxide is better

0Thank You

Rajat Barwar 6 years, 1 month ago

Mg(OH)2 is better. Bcoz it do not increase pH of stomach while the other do so.

2Thank You

ANSWER

What are the various factors affecting crystal field splitting

Posted by Neeraj Kumar Agrawal 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 1 month ago

Factors affecting crystal field splitting energy:

1) The coordination geometry and number of ligands around the metal ion- Generally, the tetrahedral field produce smaller spilling than octahedral field.
2) The nature of the ligands - Strong field ligands cause more splitting than weak field ligands.
3) The oxidation state of metals- Higher is the oxidation state of the central metal ion, greater is the crystal field splitting.

2Thank You

ANSWER

Gyz... Plz tell what changes has occured in chem. Syllabus for 2020 ... Apart from nitrogen family?

Posted by Sarthak Vats 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Sarthak Vats 6 years, 1 month ago

Ok... Thanks

0Thank You

Ritss ?? 6 years, 1 month ago

Solid state removed , and grp 15 of p block only

0Thank You

Yuvraj Singh 6 years, 1 month ago

Nitrogen family remove in cbse class 12 board

0Thank You

ANSWER

What is important in p block elements.... Suggest some important topics which will come in exam definitely...

Posted by Varsha Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Arsheen Kaur 6 years, 1 month ago

reasoning question , preparation of compounds , structure of Xe compounds are some imp que?

1Thank You

Asna Khan 6 years, 1 month ago

May be tht will help u;

1Thank You

Asna Khan 6 years, 1 month ago

Study all the textual questions in p-block as well as d&f block thoroughly......

1Thank You

Varsha Sharma 6 years, 1 month ago

Okkk tq so much shreya??

1Thank You

Shreya .. 6 years, 1 month ago

Hey dear we've not made paper so can't tell you which topics will come definitely,but you can Focus more on various trends,contact process, oxides , interhalogen compounds, xenon Oxygen compounds. Hope it helps ?

1Thank You

ANSWER

2020 boards me ellingham diagram h ki nhi?

Posted by Mirza Ubaid 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

... .. 6 years, 1 month ago

Hai

1Thank You

Duaa Khan 6 years, 1 month ago

H..

0Thank You

Yuvraj Singh 6 years, 1 month ago

0Thank You

Varsha Sharma 6 years, 1 month ago

0Thank You

ANSWER

How will you convert cumene into phenol?

Posted by Nitesh Kumar 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Asna Khan 6 years, 1 month ago

Thts in text book

0Thank You

Adi Kumar 6 years, 1 month ago

1.Cumene+o2=cumene hydroperoxide 2.Cumene hydroperoxide+ H+/H2O= phenol+acetone

1Thank You

Varsha Sharma 6 years, 1 month ago

Firstly do the oxidation of cumene and then hydrolysis of product which you get after oxidation...and you will get phenol and acetone as a side product

0Thank You

ANSWER

Plz suggest some best utube channel

Posted by Sapna Rana 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Yuvraj Singh 6 years, 1 month ago

Aman dhattarwal ki apni kaksha

1Thank You

Mirza Ubaid 6 years, 1 month ago

Arvind Arora Physicswallah Bharat chemistry Chemistry world

1Thank You

ANSWER

List of oxidising and reducing agents in organic chemistry?

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Surya Singh 6 years, 1 month ago

Eska kaya matlab hai

0Thank You

Nishant Sharma 6 years, 1 month ago

0Thank You

Surya Singh 6 years, 1 month ago

Kisi ko propose kar rahi ho kaya jo har question me rose put kar deatii hu

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ANSWER

Steps involved in acid catalysed dehydration?

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Kriti Sharma 6 years, 1 month ago

Thanks awadh?

0Thank You

Awadh Kishor 6 years, 1 month ago

Hey dear first of all google it you will get your all the answers why wait for here ? Just for your question this is my answer 1)Protonation of alcohol 2)Formation of carbocation 3)Elimination of proton

1Thank You

ANSWER

Are azeotropes in syllabus ?

Posted by Shreya .. 6 years, 1 month ago

CBSE > Class 12 > Chemistry

6 answers

Shreya .. 6 years, 1 month ago

Correct duaa??

0Thank You

Duaa Khan 6 years, 1 month ago

Cover full chptr ..cbse is not trustwrthy???

0Thank You

Meghna Shrivastav? 6 years, 1 month ago

Yeo

0Thank You

Shreya .. 6 years, 1 month ago

But this is not written in the syllabus given by cbse....thatswhy I'm in doubt ?

0Thank You

Anmol Kumar 6 years, 1 month ago

Yes

0Thank You

? ? 6 years, 1 month ago

Yes

0Thank You

ANSWER

Is a free radical mechanism of chapter polymer is in our syllabus

Posted by Riya Chaudhary 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Rohan Bhatia 6 years, 1 month ago

Yes....and u can also check on google for new updates

0Thank You

Kriti Sharma 6 years, 1 month ago

Yes?

0Thank You

ANSWER

Total vapour pressure in qustion 32 in notes how it add

Posted by Hemlata Batham 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

The configuration for vanadium in V2+ state is 3d3 4s0....The configuration for vanadium V3+ state is 3d2 4s0....So this means we need high energy to go from V2+ to V3+ state as vanadium is stable in V2+...Then why does the value of M3+/M2+ low for vanadium??Since for the same stability case the value of M3+/M2+ is high for zinc and low for iron....

Posted by ? ? 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Tamanna Sharma 6 years, 1 month ago

Because more stability of eg ( cfse) electron in V2+

0Thank You

? ? 6 years, 1 month ago

I m solely asking for vanadium!!!!?

0Thank You

Anmol Kumar 6 years, 1 month ago

Zinc is stable due to full fill orbital d^10 so high energy is needed in that case whereas in case of iron energy is comparable to vanadium

1Thank You

ANSWER

Guys wait wait ye chemistry ke paper se phle maths kyo kar rahe ho, sabka chemistry ho gya kya ,maths me 10 din he to etne jalde kyo kar rahe ho

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

mere pass toh maths he nhi hai. ????

1Thank You

Nikas Sharma 6 years, 1 month ago

Meri marji

3Thank You

ANSWER

Did anybody wrote phy 55/3/3 code how was itt

Posted by Mahesh M 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What happens to electrolytes when the cell becomes dead??

Posted by Arya Jain 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 6 years, 1 month ago

No exchange of ions hence no reaction

0Thank You

ANSWER

How to pass chemistry in board exam class 12

Posted by Harshit Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Leo 10 6 years, 1 month ago

Just get above 23 marks, It's easy even if you start studying a day before.

0Thank You

Awadh Kishor 6 years, 1 month ago

0Thank You

ANSWER

Can you provide last 10 year sample paper

Posted by Krishna Gupta 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Can anyone tell me for preparing chem....we should rely upon the cbse sample paper?? i.e. weightage given to each ch ?? Bcz physics paper wasn't according to that....

Posted by Abc ?⏳ 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Everyone plzzzz share ur jee mains jan percentile.....??

Posted by Shreya .. 6 years, 1 month ago

CBSE > Class 12 > Chemistry

9 answers

Shreya .. 6 years, 1 month ago

Thanks ?... Rajat plz share yours too...

0Thank You

Rajat Barwar 6 years, 1 month ago

Nice

1Thank You

Shreya .. 6 years, 1 month ago

98.4

1Thank You

Rajat Barwar 6 years, 1 month ago

First tell yours??

1Thank You

Lakshya ? 6 years, 1 month ago

3Thank You

Meghna Shrivastav? 6 years, 1 month ago

90%

3Thank You

Tamanna Sharma 6 years, 1 month ago

1Thank You

Shubhashish Ranjan 6 years, 1 month ago

91%tile?

4Thank You

Porash Singh 6 years, 1 month ago

82%

3Thank You

ANSWER

Is paper of chemistry come from ncerte

Posted by Harsh Tomr 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Mahi Singh 6 years, 1 month ago

Yaa

0Thank You

Mahesh M 6 years, 1 month ago

Nope

0Thank You

Hrituraj Singh 6 years, 1 month ago

Haa munnaaa

1Thank You

ANSWER

Explain crystal field theory

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 1 month ago

The crystal field theory was proposed by Hans Bethe and VanVleck. This theory gives satisfactory explanation for the bonding and the properties of complexes than the valence bond theory.

Assumptions of Crystal field theory:

The interaction between the metal ion and the ligand is purely electrostatic.

Negative ligands are treated as point charges and neutral ligands are treated as dipoles.

The five d-orbitals in an isolated gaseous metal atom (or) ion are degenerate.

The repulsions between the electrons in the metal ion and the ligands increases the energy of the d-orbitals and lifts the degeneracy in d-orbitals. This results in the d- orbitals getting split.

2Thank You

ANSWER

There are two cases ... 1)concentration reduced to 60% 2) concentration reduced by 60% Tell me what would be the final concentration in both the cases..!

Posted by Arsh Pandher 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Sarthak Vats 6 years, 1 month ago

0.6&0.4

0Thank You

Shubhashish Ranjan 6 years, 1 month ago

In First Case,It Would Be 60% But In Second It's 40%.?

2Thank You

Shreya .. 6 years, 1 month ago

1. 6o% of concentration 2.40% of concentration

3Thank You

ANSWER

A first order reaction is get 50% completed in 50 minutes.hkw long will it take (A) to reduced to 60% of its initial concemtration?

Posted by Arsh Pandher 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Abc ?⏳ 6 years, 1 month ago

Ans) It's 66.10 mins

0Thank You

Abc ?⏳ 6 years, 1 month ago

i) t½=0.693/k Given = t½=50 mins. a=100, x=60, a-x=40 ii) k=2.303/t log a/a-x...... first calculate value of k by i) formula then keep value of k in ii) formula & calculate, t.....Hope it helped u....

1Thank You

Ritss ?? 6 years, 1 month ago

266.20 min

0Thank You

ANSWER

Sbka sara preparation ho gya..

Posted by Shalini Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry