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

Steric number is used to determine hybridization .steric numbee is no of lone pairs plus no of sigma bond .for sp sn is 2 sp2 sn is 3 and so on .geometry can also be determined by steric number

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Aniket Upadhyay 7 years, 3 months ago

sp3 hybridisation refers to single bond sp2 hybridisation refers to double bond sp3 hybridisation refers to triple bond

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how boiling point is get affected by molar mass

Posted by Akash Jakhar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yagyesh Dubey 7 years, 3 months ago

Generally greater the size larger the boiling point and hence if molar mass is greater than its size is also greater therefore has larfer bp on going down the group

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G K 7 years, 3 months ago

GENERALLY, ....More be the molar mass more be the bpt...

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if molar mass of compound is high than its boiling point is also high or not

Posted by Akash Jakhar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Hy Shona 7 years, 3 months ago

Yes

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Aniket Upadhyay 7 years, 3 months ago

Yeah it id

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picric acid give effervescence of CO2 when treated with sodium carbonate but phenol does not why ?

Posted by Aman Sharma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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Give mechanism of knovagel reaction

Posted by Ayush Parija 7 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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Riemer Tiemann reaction

Posted by Anand Rajput 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Parija 7 years, 3 months ago

Riemer tiemann reaction in which phenol react with chloroform in presence of an base to give salicaldehyde .t In this reaction first dichloro carbene is formed via e1 cb elimination.then base converts phenol into phenoxide ion then resonating structure of phenoxide ion is drawn .and rhe electron density occurs at ortho position then it attacks dichloro carbene and gem halide and underogoes subsitution by aq koh and we get the desired product

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Why aldehyde is more reactive than ketone

Posted by G J 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Aastha Sharma 7 years, 3 months ago

Due to steric hindrance and +I effect of methyl group in ketone

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Which one is having bigger size florine atom or florine ion

Posted by Shivanshu Rathour 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Mohit Sepat 7 years, 3 months ago

Flourine

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Manshi Raghav 7 years, 3 months ago

Florine ion

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Define vant off factor.

Posted by Shivam Panwar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

The relationship between the actual number of moles of solute added to form a solution and the apparent number as determined by colligative properties is called the van't Hoff factor (i).
i = (apparent number of particles in solution/number of moles of solute dissolve)
It is used to express the extent of association or dissociation of solute.

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What are F-centers?

Posted by Ajay Kumar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Akash Jakhar 7 years, 3 months ago

when sodium vapour get diposited on the surface than to displace the sodium ion cl ion go at surface then the vacant place of chloride ion is known as f centre

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Aniket Upadhyay 7 years, 3 months ago

The entrapped electrons in the anionic vacency (caused by nonstoichiometric metal excess defect due to anionic vacency)

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Himanshu Sharma 7 years, 3 months ago

They trapped anion valancy

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Anjana Sherawat 7 years, 3 months ago

The vacant space in a cristal left by anions and filled by electron are called F - centre

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How to know it is a inner orbital or outer orbital

Posted by Prashant Bhati 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Diwakar Patel 7 years, 3 months ago

From p-subahell or s-subshell

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FCC centres are coloured

Posted by Dhruv Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Hy Shona 7 years, 3 months ago

F center and fcc are different.F center are coloured but fcc are not

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Diwakar Patel 7 years, 3 months ago

No they are not coloured

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Caustic soda formula?

Posted by Suhani Patel 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

Caustic soda is an alkali salt which is also called Lye. It is the common name of sodium hydroxide. This name is given due to the corrosive nature of this salt on animal and plant tissues. It has a wide range of applications. The chemical formula of sodium hydroxide is NaOH.

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Why grindnard reagent is prepared in anhydrous conditions only? Give reason.

Posted by Abhay Gupta 7 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Aniket Upadhyay 7 years, 3 months ago

Because it is very reactive and react with even very weak acid or base like water and forms corresponding alcohold

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Aastha Sharma 7 years, 3 months ago

Becoz it is very reactive species and it form hydrocarbon in the presence of moisture

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Madhur Shakya 7 years, 3 months ago

Because it is reactive reagent which can react even with the moisture ,so it is prepared in anhydrous condition.

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Electronic configurationof f block

Posted by Nancy Yadav 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Nancy Yadav 7 years, 2 months ago

Thanku

1Thank You

Hy Shona 7 years, 3 months ago

(n-2)f^1-14(n-1)d^0-1ns^2. Meri bhateeji ka naam bhi nancy hai

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Define crystal field splitting energy

Posted by Nagrare Shreya 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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Haloalkenes undergo nucleophilic substitution whereas haloarenes undergo electophilic substitution. Why ??

Posted by Nagrare Shreya 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Lakshita Garg 7 years, 3 months ago

Because in haloarenes delocalisation of electrons or negative charge takes place in close ring so the negative charge moves towards all carbon atom but in haloalkenes only 1- 2 delocalisation takes place

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Explain the henry's law about dissociation of a gas in a liquid.

Posted by Ranjan Kumar Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Diwakar Patel 7 years, 3 months ago

In dissociation of gas mass of solubility of gas is directly proposonal to mole fraction of gas

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Define gold number

Posted by Shashank Sharma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

G K 7 years, 3 months ago

Gold Number is a term used in colloidal chemistry. It is defined as the minimum amount of protective colloid in milligrams which prevents a colour change from red to violet of 10ml gold sol by the addition of 1 ml of 10%NaCl solution. Coagulation of gold sol is indicated by colour change from red to blue/purple when particle size just increases. More is the gold number, less is the protective power of the lyophilic colloid since it means that the amount required is more.

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State raoult law for a solution of volatile and non volatile liquids

Posted by Bhumi Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Lakshita Garg 7 years, 3 months ago

It states that partial vapour pressure of pure solvent is directly proportional to its mole fraction

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Give mechanism of von robert reaction

Posted by We Ayush 7 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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Is glycine asymmetric and chiral both......?

Posted by Aanchal Jain 7 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Aanchal Jain 7 years, 3 months ago

Why except glycine all other amino acids are symmetric and achiral.....?

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Aanchal Jain 7 years, 3 months ago

How is it possible......?

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Priyanshu Chandola 7 years, 3 months ago

Both

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Which has more bond angle NH3 or NH4+ and why?

Posted by Ritik Ranjan 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Ritik Ranjan 7 years, 3 months ago

Why???

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Diwakar Patel 7 years, 3 months ago

NH4+

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what is difference between chemisorption and physisorption

Posted by Mayank Goswamk 7 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Mayank Goswamk 7 years, 3 months ago

I need 3 points

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Diwakar Patel 7 years, 3 months ago

Physysorption is non-specific in nature while chemisorption is specific in nature

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Madhur Shakya 7 years, 3 months ago

Chemisorption is a chemical phenomenon of adsorption which slightly increase and then decrease with increase in temperature while physisorption is a physical phenomenon of adsorption which decrease with increase in temperature

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Prashant Chaudhary 7 years, 3 months ago

Chemisorption is a kind of adsoption which involves in chemical reaction between surface and adsorbate.

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Prashant Chaudhary 7 years, 3 months ago

Physiosorptinn,also called physical adsorption.lt is a process in which the electronic structure atom or molecule is barely perturbed upon the adsorption.

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Write difference between ideal &non ideal solution?

Posted by Manoj Savakkanavar 7 years, 3 months ago

CBSE > Class 12 > Chemistry