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

An example of dissolution of a gas in a solid is the solubility of hydrogen gas in palladium. In this, hydrogen which is a gas is solute and palladium is solvent.

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Amol Gùpta 6 years, 4 months ago

Thanks yogita

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Yogita Ingle 6 years, 4 months ago

In case a solid solution is formed between two substances (one having very large particles and the other having very small particles), an interstitial solid solution will be formed. For example, a solution of hydrogen in palladium is a solid solution in which the solute is a gas.

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direct nitration of aniline is not carried out at all. explain why?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

nitric acid being a strong oxidising agent oxidises most aniline to form tarry oxidation product.

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Amol Gùpta 6 years, 4 months ago

If direct nitration of aniline is carried, in the presence of these acids, aniline gets protonated to form anilinium ion, which is meta-directing so nitration of aniline gives meta derivative along with ortho and para.

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Gaurav Seth 6 years, 4 months ago

(H2SO4 + HNO3) easily oxidized aniline into tarry complex product due to high e- density on the benzene ring of aniline.

For direct nitration of aniline, nitration mixture is prepared which consists of H2SO4 and HNO3, both being acids. Aniline is a base. When they react acid base neutralization takes place and salt is formed.

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ANSWER

isomerisation of alkyl halide

Posted by Suraj Singh 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Aryan Bhardwaj 6 years, 4 months ago

Put alkyl halide indide your ass.

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ANSWER

Why reverse osmotis occur.

Posted by Supriya Kumari 6 years, 4 months ago

CBSE > Class 12 > Chemistry

4 answers

Hritwik Raj 6 years, 4 months ago

When presr mor than osmotic presr aplied on soln to reverse the proces of osmosis is cald so & so

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Khuskaran Sidhu 6 years, 4 months ago

If pressure applied is more than osmotic pressure,only then R.O. occer

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Gurman Kaur 6 years, 4 months ago

It is not phenomenon it is man made procees basically used for desalination

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Yogita Ingle 6 years, 4 months ago

As the name suggests Reverse Osmosis is just the reverse process of Osmosis. Osmosis can occur naturally whenever there is a difference in concentration between the two solutions. But reverse osmosis takes place only when external energy is applied to the more saline solution.
Application of larger osmotic pressure to the solution side reverses the direction of osmosis.
This phenomenon makes the pure solvent flow out of the solution through the semi permeable
Reverse osmosis is extensively used in desalination of sea

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What is difference between kp & kc?

Posted by Syeba Syed 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Rathi 6 years, 4 months ago

Kp is defined for partial pressure of involving gases i.e if a reaction has gas as reactant and product. While Kc is defined when concentration is given i.e when both reactant and product are in aqueous medium.

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ANSWER

What is the difference between sol and emulsion

Posted by Itzz Kiara 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 4 months ago

(i) Sols are dispersion of solids in liquids while emulsion are dispersions of liquids in liquids.

(ii) Sols are quite stable whereas emulsion are less stable .

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ANSWER

What is benefit of honey

Posted by Roshan Kumar Cj 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Hritwik Raj 6 years, 4 months ago

It is rich antioxidant and othr phenols which reduces risk of heart diseases

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ANSWER

why mangnese have lower melting point instead it have 5 unpaired electrons.

Posted by Ankita Dhanda 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 4 months ago

Melting point depends not only on number of unpaired electrons but also on the heat of atomization.,that is enthalpy change when it breaks into its constituent atoms.

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ANSWER

Realtionship between relative lowering of vapour pressure and mole fraction of solute

Posted by Shubham Negi 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Khuskaran Sidhu 6 years, 4 months ago

P° - Ps /p°=Xb

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ANSWER

Practical sample

Posted by Ayush Man 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Explain the zero oder reaction

Posted by Jagganath Rathod 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Hritwik Raj 6 years, 4 months ago

The reaction whose rate doesnt depend upon concentration term of the reactant

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ANSWER

Zero order reaction explain

Posted by Jagganath Rathod 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Kanak Malara 6 years, 4 months ago

In this reaction rate of reaction is independent of conc. Of reactant

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ANSWER

How to study chemistry for 12th board exam

Posted by Ashish Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Priya Dharshini ? 6 years, 4 months ago

Practice, do whole ncert thoroughly... solved unsolved both. Read ncert atleast 2 times.. i bet there will be no such question in chemistry which is out of syllabus. If u do complete ncert u can score 65+ out of 70.. for sure .

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ANSWER

Both aluminium and iron combine slowly with oxygen at room temperature. why is the rxn a problem for iron but not for aluminium?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

CBSE > Class 12 > Chemistry

14 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

ohk

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? Natasha Yadav? 6 years, 4 months ago

Your problem is chemistry mine physics. We can help each other to skill in the subjects. Rohan i don't think that your advice is bad, whatever you suggested is 100% correct. Don't doubt on yourself be confident bro

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

BTW niharika I know I had gave u wrost advice sry once again sis... I am not gud explainer. hope u understand.

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

? ? very smart... bur truly I am saying.. am just Learning how to give to the point answer in chemistry from u afterall u know my condition in chemistry... ? ? ? so just trying to observe ur answer. ? nothing else.. Haan vese tum keh bhe skti hoo ke test ker ra hoon tumhe. ?? that how much ur prepare. ?

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

welcome but I know u r testing.. ? ?

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? Natasha Yadav? 6 years, 4 months ago

Thanks for helping

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

thx Darshana ??

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

Al forms an impervious coat of Al2O3 which protects the metal from further corrosion. In contrast iron forms iron rust (Fe2O3. xH2O) which flakes off exposing fresh surface to corrosion.

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

look chapter 4 of physics is easy... try to understand first then write derivation of ur own.. then check where u have done the mistake.. then write derivation from book approx 2 times.. hope it help. I am not gud in advising sry ??

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? Natasha Yadav? 6 years, 4 months ago

Hope you can help

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? Natasha Yadav? 6 years, 4 months ago

Sorry for asking this type of question but want help. Tomorrow is test of ch4 in physics of all derivations , but i haven't done any, and my teacher want everything perfect, how should I manage. Can you tell what should I do first.

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Amol Gùpta 6 years, 4 months ago

Wlcm bro

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

ohk thx sis

3Thank You

Amol Gùpta 6 years, 4 months ago

Because iron ki reactivity jyada hoti h aluminum se so iron easily reaction krta h oxygen se and corrode ho jaata h

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ANSWER

what type of building blocks are use present in the structure of zeolites? what is this structure called.?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

CBSE > Class 12 > Chemistry

8 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

aesa hai shut up ☝ bio par mat jao

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

fir kya use hua tumhara bio lene ka. ? jub iska treatment he nhi hai tumhare paas. ?

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

abb tumhare iss shk ka illaj nhi hai humare paas ?

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

? ? miss yadav ye notes wali study se toh nhi aata. ??

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

might be there actually I just read put this chapter from ncert nd throughly follow my teacher's notes.

1Thank You

? Natasha Yadav? 6 years, 4 months ago

Is this type of answer is present in ncert.

2Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

Once again thx ? to u

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

The building blocks in zeolites are truncated octahedra. this structure is called β-cage or sodalite cage.

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ANSWER

Can anyone explain me the mechanism of Etard reaction?

Posted by Vasu Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why carboxylic acid is more acidic than phenol and alcohol

Posted by Sakshi Kaur ? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Khuskaran Sidhu 6 years, 4 months ago

Because of resonance stability of carboxylate ion

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Yogita Ingle 6 years, 4 months ago

Carboxylic acids are acidic due to resonance stabilization of carboxylate anion and in phenols, acidic character is present due to resonance stabilization of phenoxide anion. Carboxylic acid are more acidic than phenols because the negative charge in carboxylate anion is more spread out as compared to the phenoxide ion as there are two electronegative O-atoms in carboxylate anion in comparison to one in phenoxide ion. In the resosnce structures of carboxylate anion, the negative charge is present on the O-atoms while in resonance of phenoxide ion negative charge is also present on electropositive carbon atom, which leads to less stability of phenoxide ion than carboxylate anion.

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Important mechanisms

Posted by Deepika Adhana 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Add me for watsupp i have problem in chem

Posted by Pradhum Parashar 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Yash Soni 6 years, 4 months ago

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ANSWER

Why soap form only white foam

Posted by Sagar Gupta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 4 months ago

This is due to the fact that bubbles store within them relatively more air than soap material. Besides, the color of the natural light is white. What we actually see is the reflection of the natural light in the bubble, which is white.

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ANSWER

Is solid state is in syllabus of 2020-21

Posted by Aritra Choudhary 6 years, 4 months ago

CBSE > Class 12 > Chemistry

5 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Not for boards

0Thank You

Khuskaran Sidhu 6 years, 4 months ago

No. Its excluded

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Priya Dharshini ? 6 years, 4 months ago

Yaa.. it is there for jee..

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Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

no it's not there but it's in the syllabus of competitive exams like JEE nd Neet

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? Natasha Yadav? 6 years, 4 months ago

Nope

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ANSWER

Convert ehanol to chlorophenol

Posted by Poonam Ratrey 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

All organic naming reaction class 12

Posted by Kartikey Srivastav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Akhil Kumar 6 years, 4 months ago

Not possible at all

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ANSWER

Why secondary aliphatic amines cannot be prepared by Gabriel phthalimide synthesis? If anyone feel my question to be silly one then sorry

Posted by ? Natasha Yadav? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

4 answers

Amol Gùpta 6 years, 4 months ago

Because there is no any other places for nitrogen therefore it attack on terminal position and after hydrolysis ony primary amine is obtained may it will hlp you

1Thank You

Amol Gùpta 6 years, 4 months ago

Ohh sorry I misunderstood it

1Thank You

? Natasha Yadav? 6 years, 4 months ago

Sis i asked about secondary aliphatic amines not aromattic amines, but anyways thanks as u tried to answered your best. thanks once again....

1Thank You

Amol Gùpta 6 years, 4 months ago

Gabriel phthalimide synthesis is used for the preparation of aliphatic primary amines. ... But aryl halides do not undergo nucleophilic substitution with the anion formed by the phthalimide. Hence, aromatic primary amines cannot be prepared by this process.

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ANSWER

Why reaction between alcohol and sodium hydroxide doesn't take place?

Posted by Vishal Kumar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Priya Dharshini ? 6 years, 4 months ago

Alcohols are very weak acids and do not react with NaOH. Phenol is stronger acid than alcohols and react with NaOH. ... Alcohols are much weaker acids than carboxylic acids or mineral acids and do not react with weak bases (e.g., amines or bicarbonate ion , and react only slightly with strong bases.”

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What happen when s.e.p is negative or positive

Posted by Harsh Raj 6 years, 4 months ago

CBSE > Class 12 > Chemistry