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Ozone is formed when a nascent oxygen gets combine with an oxygen molecule. For obtaining nascent oxygen, one oxygen molecule should be splitted separate oxygen atoms which occur in the presence of ultraviolet rays, in nature. Since the amount of UVrays are more in the atmosphere therefore most of the ozone gets formed in the upper region of the earth. That is why we say that ozone is lighter than oxygen

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Why sulphuric acid is not oxidise hydrogen bromide into bromine

Posted by Khushi Agarwal 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Manjeet Kumar Chauhan 6 years, 4 months ago

How can define mole fraction

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Reducing character decrease from so2 to Teo2

Posted by Rakesh Bagvan 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Do you know Yo YO emiyaw Bantai

Posted by Naewm Askdad 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why the solubility of helium is lower in blood than nitrogen?

Posted by Ankit Aryan Shivan 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Vaibhav Srivastava 6 years, 4 months ago

Since noble gases are in their stable state. Therefore they easily get eliminated out from anything in which they are dissolved. Helium is also a noble gas. Therefore it can easily get eliminated fro thr blood cells. Hence the solubility of helium in blood is less than nitrogen.

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Aqueous KOH give alcohol by substitution reaction but alcoholic KOH give elimination reaction to form alkene while reacting with R-X?

Posted by Vivek Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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As per IUPAC nomenclature, the name of the complex [Co (H2O)4(NH3 )2]C13 is

Posted by Šąhîł Phogat 6 years, 4 months ago

CBSE > Class 12 > Chemistry

5 answers

Šąhîł Phogat 6 years, 4 months ago

bhai Jo tu dega vahi dunga... aur tujhse behtar result ke saath aaunga.. smjha ?

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Naewm Askdad 6 years, 4 months ago

tum kya exam dega bhai

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Student Cbse 6 years, 4 months ago

diamminetetraaquacobalt(III) chloride

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Šąhîł Phogat 6 years, 4 months ago

thanks ?

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Ritika Yadav 6 years, 4 months ago

diamminetetraaquacobalt(3)chloride

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How to prepare o-phenol from aniline?

Posted by Gayathri P B 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Naewm Askdad 6 years, 4 months ago

ncert me he gayatri devi

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Student Cbse 6 years, 4 months ago

First, diazotisation of aniline, then reaction of benzene diazonium chloride formed with warm H²O

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Why do phenols not give the protonation reaction readily?

Posted by Gayathri P B 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Methylamine solution in water reacts with ferric chloride solution to give a precipitate of ferric hydroxide. Why??

Posted by Gayathri P B 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Chemical equation for conversion of benzonitrile into acetophenone

Posted by Gayathri P B 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Test to distinguish between aniline and propanamine

Posted by Gayathri P B 6 years, 4 months ago

CBSE > Class 12 > Chemistry

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Which sample paper should be done for 100 marks

Posted by Harsh Sangal 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Vijeta Bhadana 6 years, 4 months ago

No one because 70 marks paper is their and this is only for time management and practise

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Ali Hussain 6 years, 4 months ago

Only practise is is important for getting marks

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Crystal field theory

Posted by Anjali Tomar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Vaibhav Srivastava 6 years, 4 months ago

It is a theory for coordination compounds. According to this theory the central metal of coordination compound when get surrounded by the ligands then there is an electric field generated around the central metal atom due to these ligands. This is because these ligands are anionic.

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Solid State chapter have been removed from 12th CBSE is that true

Posted by Vemula Chowdary 6 years, 4 months ago

CBSE > Class 12 > Chemistry

7 answers

Nikhil Bhosale 6 years, 4 months ago

Yes it is removed from syllabus

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Son Sammy 6 years, 4 months ago

Yes.... 100000%

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Neha Choudhary 6 years, 4 months ago

Yes

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Aman Kumar 6 years, 4 months ago

Yes it is removed

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Tejaswani Bhargav 6 years, 4 months ago

Yeah

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Faizan Ayyub 6 years, 4 months ago

Yes

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Priya Dharshini ? 6 years, 4 months ago

Ya it is removed.. 100%

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Why boiling point of water is much higher than hydrogen sulphide

Posted by Ritika Yadav 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Day Dreamer ... 6 years, 4 months ago

Intermolecular hydrogen bonding present in water

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Neha Choudhary 6 years, 4 months ago

There exist h bonding in water bt i hydrogen sulphide there exist weak vanderwaals force

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H Mohammad Arshad 6 years, 4 months ago

H_bond is the reason

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Why sulphur cant exist as S2 and why it cannot form stable p pi p pi bond

Posted by Raman Brar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Ritika Yadav 6 years, 4 months ago

because S double bond S is highly unstable

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Ruchi Tiwary 6 years, 4 months ago

Due to 3ppie-3pie weak overlapping

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When pthailamide react with caustic soda it gives.

Posted by Munesh Singh 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Vemula Chowdary 6 years, 4 months ago

Caustic soda is the most typical of the strong alkalis. Although there is no dan- ger of it exploding or igniting, it reacts with various acids

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What are Dry cell?

Posted by Ankit Gupta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Day Dreamer ... 6 years, 4 months ago

Dry cell/lechlanche cell is a type of primary cell. In this cell zinc container acts as anode (-).mno2 and C acts as cathode(+).Grahite rod acts as collector of electron .Semisolid paste of NH4Cl nd ZnCl2 acts as an electrolyte. Cell potential of this cell is 1.5V .

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Vemula Chowdary 6 years, 4 months ago

an electric cell in which the electrolyte is absorbed in a solid to form a paste, preventing spillage.

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Gaurav Seth 6 years, 4 months ago

A dry cell is a compact form of LeClanche cell. It consists of an outer container made of inc, which acts as anode. The zinc container is lined from inside with a porous insulating paper.

The cathode is a carbon rod having a brass cap. The zinc container lined from inside with a porous insulating paper. The space between the cathode and anode is filled with a mixture of MnO2 and a thick paste of ammonium chloride, (NH4Cl), zinc chloride (ZnCl2), and charcoal. The porous paper lining prevents a direct contact between zinc container and the paste, and acts as a salt bridge.

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What is nucleside

Posted by Mansi Srivastava 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Tejaswani Bhargav 6 years, 4 months ago

Combination of sugar wd base

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Yogita Ingle 6 years, 4 months ago

A nucleoside consists of a nitrogenous base covalently attached to a sugar (ribose or deoxyribose) but without the phosphate group. Several nucleoside analogues are used as antiviral or anticancer agents. Examples of nucleosides include cytidine, uridine, adenosine, guanosine, thymidine and inosine.

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A gas hypothelical chemical reaction 2A= 4B+C is carried out in a closed vessel the concentration of B is found increased by 5*10 Rate of appearance ofB

Posted by Budhi Pokhim 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

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Gatter mann koch reaction

Posted by Ritik Pingolia 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Deeya Singh 6 years, 4 months ago

C6H6 + CO + HCl -------> C6H5CHO in the presence of AlCl3 and CuCl

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Deeya Singh 6 years, 4 months ago

AlCl3 C6H6 + CO + HCl -----------> C6H5CHO CuCl

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Give an example of halogen dubstitutef aromstic compound with formula

Posted by Tanmoy Das 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

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Group 15 topic is removed this year?

Posted by Hritwik Raj 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Nishant Meena 6 years, 4 months ago

Yes

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Anchal Maurya 6 years, 4 months ago

Yes

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Why magnesium has a lower melting point than calcium and the following elements of its group?

Posted by Veena Sharma 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Vemula Chowdary 6 years, 4 months ago

All of these elements are held together by metallic bonds. The melting points get lower as you go down the Group because the metallic bonds get weaker. The oddity of magnesium has to be explained separately. The atoms in a metal are held together by the attraction of the nuclei to the delocalised electrons.

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What is ""van arkel method"?

Posted by Anita Kumari 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Anita Kumari 6 years, 4 months ago

It may be for zirconium also

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Gaurav Seth 6 years, 4 months ago

Van Arkel method (Vapour Phase Refining )
This method is based on the thermal decomposition of metal components. The process of decompositon of a compound into different substances due to the supply of heat is called thermal decomposition.

Titanium metal is purified by this method. When the impure titanium metal is heated with iodine at a temperature of 250⁰ C, volatile titanium tetra-iodide is formed (TiI₄). The impurities are left behind, as they do not react with iodine.
The titanium tetra-iodide vapour is passed over a hot tungsten filament at 1400⁰ C. The vapour is decomposed and pure titanium is deposited on the filament and is removed. The iodine is reused.

Ti	+	2I₂	250⁰C ------->	TiI₄
	Titanium tetra-iodide

TiI₄	1400⁰C ----------->	Ti	+	2I₂
	Tungsten filament	metal

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Van Arkel method (Vapour Phase Refining )
This method is based on the thermal decomposition of metal components. The process of decompositon of a compound into different substances due to the supply of heat is called thermal decomposition.

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Van Arkel method (Vapour Phase Refining ) This method is based on the thermal decomposition of metal components. The process of decompositon of a compound into different substances due to the supply of heat is called thermal decomposition.

myCBSEguide

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Van Arkel method (Vapour Phase Refining )
This method is based on the thermal decomposition of metal components. The process of decompositon of a compound into different substances due to the supply of heat is called thermal decomposition.