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

Firstly tske a deep breadth and calm down, Nancy! And secondly p d f block is important indeed but if you haven't learnt it than just go through notes from cbseguide and than try to solve ncert examples and exercise at least twice. You will gain confidence for sure.

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Killer Xmarty 5 years, 10 months ago

Properties pdh lo aur occurence bas......

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ANSWER

How to prepare all chapters?

Posted by Killer Xmarty 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Killer Xmarty 5 years, 10 months ago

Bilkul nhii pdha h yrrr

0Thank You

Deepika Brahmane 5 years, 10 months ago

Short notes.....nd must solve sample papers

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Shruti Jha 5 years, 10 months ago

Like for revision ya bilkul hi nhi padha h?

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ANSWER

Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqua solution what should be the molarity of such a sample of acid if the density of the solution is 1.504 ji gram per ml

Posted by Anshu Kumar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Tapan Pandey ?? 5 years, 10 months ago

Take the mass of solution not solvent

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Tapan Pandey ?? 5 years, 10 months ago

16.23M

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Adi Kumar 5 years, 10 months ago

16.23 M is the correct answer

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Divyanshi Sharma 5 years, 10 months ago

7.17M

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ANSWER

I have doubt regarding polymer portion in new syllabus. Where onwards i have to start it?

Posted by Amita Poreddiwar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Meghna Sharma 5 years, 10 months ago

Means is baar classification syllabus mei nhi h

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Meghna Sharma 5 years, 10 months ago

In polymers u ve to start from addition polymers

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Sufiyan Ali 5 years, 10 months ago

Polymer portion is as it is this year there is no change yet start it from starting

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ANSWER

Ambident nucleophiles

Posted by Santosh Kumar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Shivam Shukla 5 years, 10 months ago

Which Have Two Sites To Donate Lone Pair Of Electrons

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Amita Poreddiwar 5 years, 10 months ago

A Nucleophile which can execute nucleophilic attacks from two or more different places in the molecule (or ion) is called an Ambident Nucleophile

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ANSWER

There is much confusion in elimination and substitution,which will occur when?please Can anyone please tell me any source name to understand this clearly....

Posted by Rajat Barwar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Rajat Barwar 5 years, 10 months ago

Thanks for your suggestions...

0Thank You

Ankita Verma 5 years, 10 months ago

Temperature is given- elimination (base will attack) TCP Temperature is not given- substitution (nucleophile will attack) KCP Hope this helps ??????

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ANSWER

I am weak at organic chemistry? How do i complete it?

Posted by Shruti Jha 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Hare Krishna 5 years, 10 months ago

Just understand the basics of organic chemistry like how the bond is broken in homolytic and hetrolytic fission. , Electronegativty series and learn the name reactions.

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Shruti Jha 5 years, 10 months ago

Okay! Thanks a ton you.

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Meghna Sharma 5 years, 10 months ago

Becoz if u notice all the ques r realted to naming reactions whether it is conversion or compltete the reaction.

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Meghna Sharma 5 years, 10 months ago

Start with the naming reactions n then u will feel that u have covered almost all the chapters

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ANSWER

Cleansing action of soaps

Posted by Hrishikesh Sarma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Adi Kumar 5 years, 10 months ago

When you apply soap to dirty part of your clothes,the hydrophobic part(tail)attached to thr dirt and hydrophilic head towards outside. Now on applying water, the coona part of the stearate ion removes the dirt from the clothes Si the conclusion is that the soap form micelles around thendirt paet and remove it.

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Khushi Rai 5 years, 10 months ago

Can you talk to me...........,........at insta

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Khushi Rai 5 years, 10 months ago

Hey

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Shruti Jha 5 years, 10 months ago

Jii

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ANSWER

Antinoids display a variety of oxidation state

Posted by Sahil Khurana 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

smit****@***** 5 years, 10 months ago

Because 5f.6d and 7s are of comperable energies

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ANSWER

Give all the examples of ANTIHISTAMINES.

Posted by Meghna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Meghna Sharma 5 years, 10 months ago

Zentac and ranitidine r the same thing

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Riya Rana 5 years, 10 months ago

Cimetidine, rantidine, seldone, zantac.

1Thank You

ANSWER

conversion propanone to propane

Posted by Amisha Priyadarshini 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 5 years, 10 months ago

Clemmensons reduction can be done { add Zn-Hg }

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ANSWER

Tetration

Posted by Gurpreet Bamrah 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Meghna Sharma 5 years, 10 months ago

Titration is a method used todetermine the strength of the solution when titrating it against a solution with known strength. THIS WAS THE FIRST QUESTION ASKED TO ME INMY PRACTICAL EXAM.

1Thank You

Shruti Jha 5 years, 10 months ago

???

1Thank You

Aditya Vinay 5 years, 10 months ago

u r dumb

1Thank You

ANSWER

Notes of chemistry..chwm

Posted by Humdu Khan 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why did the ortho product is the major product in reimer teimen reaction

Posted by Mashud Alom 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Nancy Verma 5 years, 10 months ago

We know that I effect dies with distance so ortho postion will be more electron reach as compare to para position and incoming electrophile will attack Ortho carbon so we get Ortho Product is the major product reimer teimen reaction

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ANSWER

How we can say that Raout's law a special case of henry las

Posted by Amit Kushwaha 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tapan Pandey ?? 5 years, 10 months ago

Report him guys

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ANSWER

What is lattice energy and hydration energy

Posted by Ramendra Pratap Mishra 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Muskaan Vig 5 years, 10 months ago

Lattice energy is energy released when ions combine to form crystal lattice....hydration energy is energy releases when lattice breaks into ions in water..

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ANSWER

I need karnataka board sample papers

Posted by Aishwarya Aishwarya 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Iupac name of (ch3)2c=cbrch2oh

Posted by Navjot Singh 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Arya Singh 5 years, 10 months ago

2-bromo-3-mehylbut-2-en-1-ol

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Aishwarya Aishwarya 5 years, 10 months ago

2-bromo3-dimethylprope1-nol

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Gouri Mishra 5 years, 10 months ago

2-bromo3-methylbut-2enol

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ANSWER

C6H5CH2CH2OH IUPAC name

Posted by Nazibul Hossain 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Arya Singh 5 years, 10 months ago

2-phenylethanol

1Thank You

Akhil Sharma 5 years, 10 months ago

2-phenylethanol

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Gouri Mishra 5 years, 10 months ago

2-phenylethanol

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ANSWER

IUPAC names insret question of 11.3. Example

Posted by Anil Saran 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

B+

Posted by Vijay Kumar Bishnoi 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Relation between molarity and molality?

Posted by Subham Sahu 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 10 months ago

Let the mass of given solute be W.

Let the volume of the solution be V.

Let the molality be m.

Let the molar mass of solute be M’.

Let the Molarity be M.

Let the weight of the solvent be W’.

Therefore the Molarity, M = W/M′∗1000/V ………(1)

Therefore the molality, m = W/M′∗1000/W′ …….(2)

Density, d = M/V

= (W+W′)/V

From (1)

V = W∗1000MM′ …………. (3)

From (2)

W’ = W∗1000/mM′

Therefore,

W+W’ = W+W∗1000/mM′ 1000M′[mM′1000m+1m]W′ …………(4)

By dividing equation (4) by (3) we get,

dM=1/m+M′1000 1/m=d/M−M′1000 m=M∗1000/(d∗1000)−M(M′)

Hence the relation between molality and Molarity proved.

2Thank You

Divya Shrivastav 5 years, 10 months ago

molarity - no. of moles of solute dissolved in per litre of solution molality- no. of moles of solute dissolved in per kg of solvent

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ANSWER

Important chapters??

Posted by Rameez Khan 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Aishwarya Aishwarya 5 years, 10 months ago

Electrochemistry p-block aldehydes,ketones carboxylic acids

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Nancy Verma 5 years, 10 months ago

Coordination compounds Chemical kinetics Surface chemistry Biomolecules Electrochemistry P block elements

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ANSWER

Difference between furctose and glucose

Posted by Nancy Verma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Yogita Ingle 5 years, 10 months ago

GLUCOSE	FRUCTOSE
Also known as grape sugar	Also known as fruit sugar
Six-membered ring	Five-membered ring
The preferred energy source for the body	Not the preferred energy source for brain and muscles
Less lipogenic	More lipogenic
Less fat producing	More fat producing
Relies on hexokinase/ glucokinase for initiating metabolism	Relies on fructokinase for initiating metabolism
It is an aldohexose	It is a ketohexose
Forms a pyranose ring structure	Forms a furan ring structure

1Thank You

Rameez Khan 5 years, 10 months ago

Yess..thanks

1Thank You

Alpha Fiend 5 years, 10 months ago

If this question is asked in 1-2 marks (Previously asked in 2019) You can mention the main difference, i.e. Fructose have ketone group attached but glucose have aldehyde (glucose is aldose, fructose is ketose). You can make structure for them as well.

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ANSWER

koi mechanism ke baare me bata do yrr please

Posted by Ankit Srivas 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Ankit Srivas 5 years, 10 months ago

sn santal kya hai

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Muskan Sharma 5 years, 10 months ago

Do mechanism from ncert

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Tamanna Sharma 5 years, 10 months ago

S n sanyal se pad lo

3Thank You

ANSWER

Methanol_butanal

Posted by Sona Sunish 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Ankit Srivas 5 years, 10 months ago

methanol=CH3-OH BUTANAL=CH3-CH2-CH2-CHO

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ANSWER

Conversion of P nitro toluene to 2-bromo benzoic acid

Posted by Harsh Kumar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 10 months ago

1. Br2,,,,,,,2. Sn/HCl,,,,,,,,3.NaNO2/HCl,,,,,,4.H2O/H+,,,,,,,5.KMnO4/OH-

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ANSWER

What is mechanism of micelles

Posted by Naziya Niazi 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Tamanna Sharma 5 years, 10 months ago

Oo...great Tapan, l think you are henry and by mistake you enter in soap industry.. ..just kidding ??

0Thank You

Tapan Pandey ?? 5 years, 10 months ago

Micelles means solubility

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ANSWER

Why Bond angle of H2O is greater than H2S ?

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

10 answers

Mahi D 5 years, 10 months ago

Bond angle is directly proportional to electronegativity of central atom. as electronegativity of O is more than S so bond angle of H2O more than H2S. Due to more electronegativity of oxygen electron cloud shift towards it and this lead to increase in b.p-b.p repulsion

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Riya Rana 5 years, 10 months ago

But then Oxygen is more electronegative than sulphur and there will be more repulsion in o-o and thus the bond angle is more.

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Tamanna Sharma 5 years, 10 months ago

But here inH2O only one oxygen is present and same for S in H2S

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Tapan Pandey ?? 5 years, 10 months ago

Oxygen--oxygen repulsion is more than sulphur-- sulphur repulsion

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Tapan Pandey ?? 5 years, 10 months ago

Because, oxygen is more electronegative as compared to sulphur