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

Phosphine is weakly basic and like ammonia, gives phosphonium $PH_4Br \to$ compounds with acids e.g., PH3+HBrPH3+HBr Due to lone pair on phosphorus atom, PH3PH3 is acting as a Lewis base in the above reaction. For more detail read from book

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ANSWER

Resonance condition in cyclotron. Explain

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

10 answers

Ritu Gupta 7 years, 11 months ago

so can u pls tell me what is 2DES here??

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Abc Efg 7 years, 11 months ago

How can you say that I have not understand the concept.... And also gaining the marks are equally important to understanding the concept..

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Ritu Gupta 7 years, 11 months ago

komiii S i think gaining marks is not more important to understand the concept. The answer you have given is not understandable by anyone and may be even you.

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Abc Efg 7 years, 11 months ago

To Kya ab pura SL Arora ratta karoge kyaa.. The answer which I have given to you that is perfect and may you get full marks in exam..

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Ritu Gupta 7 years, 11 months ago

Yes ujjawal i m ryt and fore more, read in ncert

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Ujjawal Sharma 7 years, 11 months ago

I think Ritu answer is right

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Ritu Gupta 7 years, 11 months ago

Komii S i think the ans you have given is out of syllabus of 12th. Otherwise resonance is that condition when frequency of applied voltage is equal to the cyclotron frequency.

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Bhumi Jain 7 years, 11 months ago

Don't worry Komii S will tell you the other book name along with pg no.

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Ujjawal Sharma 7 years, 11 months ago

S.L ARORA ME TO AISA KHI PER BHI NAHI LIKHA

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Abc Efg 7 years, 11 months ago

It is established that cyclotron resonance (CR) in a high-quality GaAs/AlGaAs two-dimensional electron system (2DES) originates as a pure resonance that does not hybridize with dimensional magnetoplasma excitations. The magnetoplasma resonances form a fine structure of the CR. The observed fine structure of the CR results from the interplay between coherent radiative and incoherent collisional mechanisms of two-dimensional plasma relaxation. We show that the range of 2DES filling factors from which the phenomenon arises is intimately connected to the fundamental fine-structure constant.

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ANSWER

What is hydrophobic

Posted by Bijen Sagolsem 7 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Abc Efg 7 years, 11 months ago

Nonpolar molecules that repel the water molecules are said to be hydrophobic; molecules forming ionic or a hydrogen bond with the water molecule are said to be hydrophilic.

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Iveleen Mal 7 years, 11 months ago

Hydro: water phobic: hate

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ANSWER

Conjugate acid and conjugate base

Posted by Iveleen Mal 7 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Abc Efg 7 years, 11 months ago

This is not a perfect answer.

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Ujjawal Sharma 7 years, 11 months ago

Base has conjugate acid and acid has conjugate Base

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ANSWER

Why ozone is thermodynamically unstable

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

9 answers

Abc Efg 7 years, 11 months ago

O you are apsalutly correct bhumii.. I m just kidding

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Bhumi Jain 7 years, 11 months ago

Komii he is not telling about my ans he is talking about yours????

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Abc Efg 7 years, 11 months ago

Where she has written that heat is released.. ujjwal

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Ujjawal Sharma 7 years, 11 months ago

But in your answer you give heat released

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Bhumi Jain 7 years, 11 months ago

Sry by mistake it happened...For ozone it is +G

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Abc Efg 7 years, 11 months ago

Yess afcourse ujjwal ozone prosses is endothermic

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Bhumi Jain 7 years, 11 months ago

Here the ΔG(gibb's free energy is the determining factor.The chemical species with +G is considered to be thermodynamically unstable with respect to its element & they have spontaneous tendency to decompose to its constituents elements.For ozone it is -G &is thermodynamically unstable.The equilibrium constant for formation of ozone is less than one.But it survives because the reaction of decomposition of ozone to O2 is very slow.

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Ujjawal Sharma 7 years, 11 months ago

But the ozone process endothermic

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Abc Efg 7 years, 11 months ago

Ozone is thermodynamically less stable than oxygen because its decomposition into oxygen results in the liberation of heat. Ozone consists of three molecules of oxygen and thus in this its in unstable state so in order to get stable it gives up its one molecule of oxygen to restore diatomic state. Eventually, in all thus process large amount of heat is released.

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ANSWER

Why NH3 HAS LESS CATENATION TENDENCY THAN PH3

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

14 answers

Abc Efg 7 years, 11 months ago

Yess he can't

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Bhumi Jain 7 years, 11 months ago

Coz he is not having proof than how he will

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Abc Efg 7 years, 11 months ago

Yess bhumii I think he can't prove us..

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Bhumi Jain 7 years, 11 months ago

Komii I think he can't

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Bhumi Jain 7 years, 11 months ago

Plzz ujwal prove na that we have copied

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Bhumi Jain 7 years, 11 months ago

How Ujjwal prove it..

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Abc Efg 7 years, 11 months ago

How can you say that we have copied

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Ujjawal Sharma 7 years, 11 months ago

you both are copy

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Bhumi Jain 7 years, 11 months ago

See when I and U have posted the ans there is a gap...

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Bhumi Jain 7 years, 11 months ago

No way...I have my own ans you have copied mine

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Abc Efg 7 years, 11 months ago

Hey!! Bhumii u have copy my answer

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Abc Efg 7 years, 11 months ago

The single N-N bond is weaker than P-P bond because of high interelectronic repulsion of the non-bonding electrons, owing to the small bond length. As a result the catenation tendency is weaker in nitrogen.

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Bhumi Jain 7 years, 11 months ago

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Iveleen Mal 7 years, 11 months ago

Because of there size.

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ANSWER

Diazonium salt is more stable. Why?

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Iveleen Mal 7 years, 11 months ago

Dispersal of positive charge on benzene ring due to resonance

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ANSWER

Why is racemization occur in Sn1 REACTION

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why is amine give meta isomer

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Ujjawal Sharma 7 years, 11 months ago

In strong acidic medium, aniline protonates to form anilinium ion , which is meta directing

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Anmol Sharma 7 years, 11 months ago

Due to the formation of NH3+

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ANSWER

Tollenreagent

Posted by Anuj Katoch 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Ujjawal Sharma 7 years, 11 months ago

Ammonical AGNO3

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ANSWER

Meso compounds

Posted by Rajat Kashyap 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Vivek Badhwar 7 years, 11 months ago

meso compound is a molecule with multiple stereocenters that is superimposable on its mirror image. These particular traits lead to specific qualities that meso compounds do not share with most other stereoisomers.

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ANSWER

Splitting in d orbitals figure

Posted by Mihir Srivastava 7 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Distinguish between bromo benzene and benzyl chloride

Posted by Abhishek Kumar 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Patel 7 years, 11 months ago

Benzyl chloride reacts with aq Koh while bromo benzene does not

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ANSWER

Which type of cell is use in watch

Posted by Abhishek Kumar 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Snigdha Sagar 7 years, 11 months ago

Mercury cell

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ANSWER

What is kharaush effect

Posted by Bhuvanesh V 7 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How does acetone react with sulphuric acid?

Posted by Sakshi Verma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Patel 7 years, 11 months ago

Ch3coch3 +h2so4--------+-ch3chohch3

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ANSWER

Define saytzeff rule

Posted by Sakshi Verma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How is charge particle is out from cyclotron. While magnetic field rotate it on circular path.

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Ujjawal Sharma 7 years, 11 months ago

Give answer please

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ANSWER

Differenciate between paramagnetic and diamegnetic substances

Posted by Sourabh Thakur 7 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Shrivastava 7 years, 11 months ago

Paramagnetic substances contain unpaired electrons whereas diamagnetic substances contains paired electrons.

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ANSWER

Why is alpha hydrogen is more acidic.

Posted by Ujjawal Sharma 7 years, 11 months ago

CBSE > Class 12 > Chemistry

7 answers

Ujjawal Sharma 7 years, 11 months ago

Yes because it is for me

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Divya Sen 7 years, 11 months ago

No but mostly i have seen that u first put up a questn and then when somebody gives ans u always make corrections... u urself write the que and aldo the ans

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Ujjawal Sharma 7 years, 11 months ago

OK I put question which I not know

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Bhumi Jain 7 years, 11 months ago

Divya u r correct..I am with you

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Divya Sen 7 years, 11 months ago

If you know the ans then why did u put up the questions??

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Ujjawal Sharma 7 years, 11 months ago

No, it is due to electron withdrawing nature of carbonyl group and resonance stabilisation of hydrogen make it acidic.