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

Work on the formula, naming reactions, equations, preparation of both inorganic and organic compounds, make your own notes for each chapter from NCERT, and do a little more hard-smart-work

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Hemanth Raj Boopathy 4 years, 5 months ago

Learn all the NCERT material from your heart!

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Chennai sahodhaya school complex examination questions paper 2020-21 chemistry

Posted by Saraswathi S 4 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

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Why are electronic configuration of lanthanide series are not known with certainity

Posted by Arushi Singh 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

P....... ........ 4 years, 5 months ago

electronic configurations are also related to the stabilities of f0 f7 and f14 occupancy of f-orbitals. Hence, their electronic configurations are not known with certainty.

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Why the window panes of old buildings becomes translucent?

Posted by Priyanka Patel 4 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

I A 4 years, 5 months ago

Due to some crystallisation

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P....... ........ 4 years, 5 months ago

Like liquid it has tendency to flow therefore in old building the bottom of the glass panes look milky in appearance or thicker because glass over the years flown down under the influence of gravity.

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Difference between molecular solids, ionic solids, metallic solids and covalent solids

Posted by Rashmitha C N Rashmitha C N 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Student Of The Year 4 years, 5 months ago

See NCERT chemistry part 1, page no. 6

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Raoult's law is special case of Henry's law. Similarities and Dissimilarities.

Posted by Hitesh Jindal 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Nidhi Bharti 4 years, 5 months ago

Consider a gas dissolved in a liquid. It's partial pressure can be calculated by henry law (P = Kh X ). For applying Raoult's law the solute is more volatile such that it is present in gaseous state. Its partial pressure can be given by Raoult's law (P = P°X) . Considering both formulas there is only a difference in the constants P° and Kh.

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What is coordination polyhedron?

Posted by Sagar Hansda 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Anurag Maheshwari 4 years, 5 months ago

when legand attached to the central metal atom it gives rise to the geometry of the coordination compound is called is coordination polyhedron..

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Yarr meri abhi 12th chalu hui hai ...or main jee advance ke liye BHI prepare kr rha hu tho ...mujhe koi bta skta hai ki boards ke liye chemistry Saath mai kaise padhe

Posted by Ajay Bodkhe 4 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Rιʂԋιƙα Kumari 4 years, 5 months ago

Alag se time dedo , and mostly aapko aaenge because jee me aap upper level ki chemistry pdh chuke hoge, to easy hoga board ki chemistry pdhna, sirf NCERT follow kro best rhega

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Aditi Rai 4 years, 5 months ago

Aap chem ko subh phdhoo 4 s 7 nd rest time for other sub

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Koi mujhe chemistry k ch 1 ke notes de skta h.....m abhi class 12 me huii hu...

Posted by Dark ..? 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Anurag Saral 4 years, 5 months ago

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Aahana ❄❄ 4 years, 5 months ago

unka acche notes hai

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Vivek Chaurasia 4 years, 5 months ago

Okk... Es sa achha ha aap aman dhattarwal APNI KAKSHA pa note download kr lo youtube sa.. bhut achha note h.. Or Mere pss vi h..

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How to study organic in a effective way

Posted by Rupali Kanwat 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Sheela Parihar 4 years, 5 months ago

Rupali you practice daily 10 reaction with concept or you can do named reaction learn well with concept

4Thank You

Affu 😊 4 years, 5 months ago

I think tumhe ncert juice dekhna chahiye by Singh sahab on youtube. Ek page me ek chapter karaya h unhone . Aur kaafi beneficial bhi hai for revise

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Mamta ... 4 years, 5 months ago

Rupali pahele NCERT par focus karo har eek line padho book ke...make mind maps.... discuss the topics with ur classmates...

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Why aldehyde is more reactive then ketone towards nucleophilic

Posted by Rupali Kanwat 4 years, 5 months ago

CBSE > Class 12 > Chemistry

5 answers

I A 4 years, 5 months ago

Due to less steric hinderence in aldehydes then ketones

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Nidhi Bharti 4 years, 5 months ago

Aldehyde are more reactive because in ketone there are 2 alkyl goups which causes more stearic hindrance to the nucleophile but in Aldehyde there is only 1 alkyl group. Also due the presence of 2 alky group, +I effect is more on carbony carbon of ketone which reduces it's electrophilicity

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Ayush Purohit 4 years, 5 months ago

Due to Resonance effect

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Rupali Kanwat 4 years, 5 months ago

Ohh thanx

1Thank You

Aks Gaming 4 years, 5 months ago

Due to resonance

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Preparation of soyabean milk and its comparison with natural milk

Posted by Aks Gaming 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 5 months ago

Preparation of soyabean milk

Soak about 100 g of soya beans in sufficient amount of water for 24 hours.
Take out swollen soya beans and grind them to a very fine paste with a pestle-mortar.
Add about 250 ml of water to this paste and filter it through a muslin cloth.
Clear white filtrate is soya bean milk.

Compare its taste with natural milk.

Take 50 ml of natural milk in three beakers and heat the beakers to 30^o, 40^o and 50^o C respectively.
Add spoonful curd to each of the beakers and leave the beakers undisturbed for 8 hours and curd is ready.
Similarly, take 50 ml of soya bean milk in three other beakers and heat the beakers to 30^o, 40^o and 50^o C respectively.
Add 1 spoonful curd to each of these beakers. Leave the beakers.

4 undisturbed for 8 hours and curd is formed.

Type of milk	Beaker no	Temperature	Quality of curd	Taste of curd
Buffalo milk	1	30^oC	Perfectly dense semi solid	Sour
2	40^oC	Compartively watery	Less sour
3	50^oC	Highly watery	Tasteless
Soya bean milk	4	30^oC	Almost dense	Sour
5	40^oC	Semi solid little bit watery	Sour
6	50^oC	High water content	Tasteless

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Iron on reaction with HCL forms feCL2 and not FeCL3.Why ???

Posted by Yatharth Singh 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Last Bencher 4 years, 5 months ago

Hydrogen liberated during the process prevents oxiddation of fecl2 to fecl3

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What is carbylamine test

Posted by Chandrakesh Saini 4 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Last Bencher 4 years, 5 months ago

R-NH2+CHCL3+3KOH givesR-NC+3KCL+3H20

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Last Bencher 4 years, 5 months ago

It is a tes used as a test for primary amines.

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Hlo im very sad ....... becoz abhi tk mujhe oaganic nii aa rha ??.......

Posted by Sumit Bro 4 years, 5 months ago

CBSE > Class 12 > Chemistry

5 answers

Rupali Kanwat 4 years, 5 months ago

Same here bro..

1Thank You

Yatharth Singh 4 years, 5 months ago

Do hard work and always stay happy... be positive..I hope you will be topper in board exam?

3Thank You

Mamta ... 4 years, 5 months ago

N don't be sad Sumit, always stay happy....face things in a positive manner bcuz happy rahenge toh phir he hamari good memories banengi ryt ..... I hope in boards uhh will rock on dear✨

3Thank You

Mamta ... 4 years, 5 months ago

Yes pahele NCERT par focus karo, har eek line padho book ke... bass.

4Thank You

Aahana ❄❄ 4 years, 5 months ago

Sabse pehle base clear karo 11 ke chapter read karke then aage ka padho ??

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What are voids

Posted by Samayara Singh 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Sumit Bro 4 years, 5 months ago

in short gaps btw. 3 sphers when they r packed

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Vcci Yadav 4 years, 5 months ago

Vacant spaces between constituent particles in close packing of solids. Eg- Trigonal voids Tetrahedral voids Octahedral voids

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Paras Mehta 4 years, 5 months ago

The empty space present between the particals when they are packed with in a crystal is called void

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Why is glass considered as super cooled liquid?

Posted by Paras Mehta 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Komal Yogi 4 years, 5 months ago

Due to internal translational motion...of glass

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Nidhi Sharma 4 years, 5 months ago

Bcz they have the ability to flow like liquid. This can be observed in the old buildings, where the window glass can be seen thicker at the bottom then the top.

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Ashutosh Tripathy 4 years, 5 months ago

Because they have ability to flow .

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Define the following term molality.state one disadvantage in using the molality as the unit of concentration

Posted by Princy C 4 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Last Bencher 4 years, 5 months ago

Wb/Mb*Wa{kg}

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Wurt's reaction

Posted by Rahul Kumar 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Yatharth Singh 4 years, 5 months ago

CH3-Br + 2Na + Br-CH3 in the presence of dry ether gives CH3-CH3 + 2NaBr

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Rishab Jain 4 years, 5 months ago

See all related science channel on YouTube , it's a very god channel, I can also seen in this , in this there is a song mere rashques kammar

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Jitender Singh 4 years, 5 months ago

Simple, In this reaction to same kind of alkali halides react with sodium in the presence of dry ethane than they form even number of carbon atom alkane.

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Why is adsorption

Posted by Shailesh Adroja 4 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Sajith Kumar 4 years, 5 months ago

Adsorption is the accumulation of molecular species on the surface rather than in bulk of solid or liquid

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Rishab Jain 4 years, 5 months ago

Adsorption is a process in which the particle adsorb (means on the surface not inside the surface) . The particle which is adsorb is called adsorbate . The thing on which a particle get adsorb is called adsorbent . Example-if we dipped chalk in ink and break the chalk then you will see that it is white inside ,and blue on the surface means adsorption takes place

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Oggy And Jack 4 years, 5 months ago

Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent.

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What is chelation?

Posted by Robin Chaudhary 4 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Last Bencher 4 years, 5 months ago

Hope it will help

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Last Bencher 4 years, 5 months ago

When a bi or multi dentate ligand is attached to central metal atom to form a cyclic or ring compound. This complex is called chelating complex and the ligand is called chelating ligands

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Why is adsoption

Posted by Bunty Kumar 4 years, 5 months ago

CBSE > Class 12 > Chemistry