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Fitting reaction

Posted by Abbas Alam 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Which letter of english is not present in the periodic table

Posted by Sumit Gupta 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Akshay Singh 8 years, 3 months ago

2Thank You

Meghana Shetty 8 years, 3 months ago

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Chlorin has higher electron gain enthalpy but florin is a stronger oxidising agent why?

Posted by Cybil Thomas 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Anshika Mishra 8 years, 3 months ago

Because size of fluorine is very is smaller than chlorine

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Why silicon different from

Posted by Veera Tushir 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Why silicon different from others elements

Posted by Veera Tushir 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Friedal craft reaction

Posted by Ashvendra Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is meant by " theory of valence" in ncert book page no. 210 1st para ? Is it theory of valency ?

Posted by Baishaki Dey 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Define van arkel method and froth floatation process

Posted by Sanskar Monnat 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Kapil Rajput 7 years, 7 months ago

• This method is extensively employed for the preliminary treatment of the minerals especially sulphides ore
• The process is based on the difference in wetting characteristics of the gangue and the ore with water and oil
• The gangue surface being wetted by water and of ore surface the by oil
• The crushed ore along with water (slurry) is taken in a floatation cell
• The impure crushed ore is taken in the big tank provided the resulting mixture is agitated vigorously by passing compressed air through a perforated pipe
• The ore particles are preferentially wetted by oil which rises up to the surface with froth or foam formed by the oil and air
• The gangue impurities being wetted by water settle to the bottom of the tank. The foam gets transferred to the other side of the tank where it slowly subsides
AND
Van Arkel Method:

• This is used for getting ultra pure metals
• The principle involved is to convert the metal to a volatile unstable compound and to subsequently decompose it to give the pure metal
• Metals like titanium, zirconium are purified by using this method

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Sp2 hybridization

Posted by Keshav Varshney 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is isotropic and anisotropic?

Posted by Nilabh Choudhury 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Akshay Singh 8 years, 3 months ago

Isotropic means the physical properties such as refractive index are same from all the sides of the crystal and amorphous solids are isotropic in nature whereas the crystalline solids are anisotropic in nature as there physical properties are different in all the directions

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H2o

Posted by Niharika Agnihotri 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

Water

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Most strongest element in periodic table

Posted by Subham Verma 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Which element has least density

Posted by Pooja Garg 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

Scandium has least density

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Full form of fcc

Posted by Harsh Kumar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Anuradha Gupta 8 years, 3 months ago

Face centers unit cell

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Chemiosorption is highly specific. Illusate with an example

Posted by Sakshi Haste 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is froth floatation method

Posted by Rahul Kumar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is process of froth floatation method

Posted by Rahul Kumar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Difference between p block and d block

Posted by Aarti Bhagat 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Simrandeep Kaur 8 years, 3 months ago

D blocks are those whose last electron enter in d subshell

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Deepanshu Banyal 8 years, 3 months ago

In p block the valance electrons of all element entres the p subshell and in the s block the valance electrons entres the s subshell

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if half life of a first order reaction at 300K is 20min and at 310K is 4min then calculate activation energy

Posted by Mouli Nag 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is the chemical formula of ' chrophyll'?

Posted by Girish Vatsaraj 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What are alkaloids?

Posted by Astha Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is intrinsic semiconductor

Posted by Vinayak Jaiswal 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Rashim Sharma 8 years, 3 months ago

An intrinsic semiconductor is an undoped semiconductor. This means that holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band as opposed to doped semiconductors where holes or electrons are supplied.

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In which factor depend the atomisation

Posted by Jyoti Ghanghas 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Define ferromagnetic substances

Posted by Jyoti Ghanghas 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Sarthak Garg 8 years, 3 months ago

the magnetic dipoles are in group atoms and have high m property

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Rashim Sharma 8 years, 3 months ago

Substance are those whose magnetic moment is large and after the removal of external magnetic field the still remain magnetic.

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How to predict the bond order of O2(PtF6)

Posted by Afshan Mughal 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Anshal Tomar 8 years, 3 months ago

The bond order of o2 will be 2 as there are 10 electrons in bonding molecular orbital and 6 electrons in antibonding molecular orbitals.

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Eletrolysis

Posted by Rishu Gangwar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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How does the presence of double bonds in rubber molecules influence their structure and reactivity

Posted by S P 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

Double bond provides extra strength and also increases the melting point and boiling point

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Diff between log and ln

Posted by Om Sah 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Please can someone give me the role and examples of reagents used in organic chemistry??( Imp. Reagents)

Posted by Ankita Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Rashim Sharma 8 years, 3 months ago

Synopsis Reagents aresubstances or compounds that are added to a system in order to bring about a chemical reaction or are added to see if a reaction occurs. Some reagents are just a single element. However, most processes require reagents made of chemical compounds. Some of the most common ones are listed below.

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What are the causes of peptisation

Posted by Rashim Sharma 8 years, 3 months ago

CBSE > Class 12 > Chemistry