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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, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Manjeet Kumar Chauhan 6 years, 1 month ago

How can define mole fraction

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Reducing character decrease from so2 to Teo2

Posted by Rakesh Bagvan 6 years, 1 month ago

CBSE > Class 12 > Chemistry

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Do you know Yo YO emiyaw Bantai

Posted by Naewm Askdad 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Vaibhav Srivastava 6 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Šąhîł Phogat 6 years, 1 month ago

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

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Naewm Askdad 6 years, 1 month ago

tum kya exam dega bhai

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Student Cbse 6 years, 1 month ago

diamminetetraaquacobalt(III) chloride

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Šąhîł Phogat 6 years, 1 month ago

thanks ?

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Ritika Yadav 6 years, 1 month ago

diamminetetraaquacobalt(3)chloride

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How to prepare o-phenol from aniline?

Posted by Gayathri P B 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Naewm Askdad 6 years, 1 month ago

ncert me he gayatri devi

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Student Cbse 6 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Chemical equation for conversion of benzonitrile into acetophenone

Posted by Gayathri P B 6 years, 1 month ago

CBSE > Class 12 > Chemistry

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Test to distinguish between aniline and propanamine

Posted by Gayathri P B 6 years, 1 month ago

CBSE > Class 12 > Chemistry

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Which sample paper should be done for 100 marks

Posted by Harsh Sangal 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Vijeta Bhadana 6 years, 1 month 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, 1 month ago

Only practise is is important for getting marks

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Crystal field theory

Posted by Anjali Tomar 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Vaibhav Srivastava 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

7 answers

Nikhil Bhosale 6 years, 1 month ago

Yes it is removed from syllabus

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Son Sammy 6 years, 1 month ago

Yes.... 100000%

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Neha Choudhary 6 years, 1 month ago

Yes

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Aman Kumar 6 years, 1 month ago

Yes it is removed

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Tejaswani Bhargav 6 years, 1 month ago

Yeah

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Faizan Ayyub 6 years, 1 month ago

Yes

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Priya Dharshini ? 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Day Dreamer ... 6 years, 1 month ago

Intermolecular hydrogen bonding present in water

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Neha Choudhary 6 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ritika Yadav 6 years, 1 month ago

because S double bond S is highly unstable

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Ruchi Tiwary 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Vemula Chowdary 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Day Dreamer ... 6 years, 1 month 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, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Tejaswani Bhargav 6 years, 1 month ago

Combination of sugar wd base

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Yogita Ingle 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Gatter mann koch reaction

Posted by Ritik Pingolia 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Deeya Singh 6 years, 1 month ago

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

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Deeya Singh 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

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Group 15 topic is removed this year?

Posted by Hritwik Raj 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Nishant Meena 6 years, 1 month ago

Yes

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Anchal Maurya 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Vemula Chowdary 6 years, 1 month 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, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Anita Kumari 6 years, 1 month ago

It may be for zirconium also

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Gaurav Seth 6 years, 1 month 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.

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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.