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

Due to f-electrons in inner cell, Shielding effect decrease which cause decrease in size from 2nd transition series to 3rd transition series....So elements of both period elements hv about same atomic and ionic radii.this is called lanthenoid contraction

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Is isomerism topic ch 9 still in syllabus ?...and metal Co bonding ?

Posted by Drishty Kamboj 5 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Yadav T 5 years, 1 month ago

Only structural isomersims in topi which are 4 type

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Shruti Singh 5 years, 1 month ago

Isomerism is not there bonding one is there..

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Conversion of 1 bromopropane to 2- bromopropane

Posted by Vikas Yadav 5 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Sumant Kumar 5 years, 1 month ago

---------> CH3-CH(Br)-CH3 FIRST STEP: CH3-CH2-CH2-Br + Alcoholic KOH + heat ----------> CH3-CH=CH2 SECOND STEP: CH3-CH=CH2 + HBr (Markonikov's rule)-------> CH3-CH(Br)-CH3

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What is aldol condensation reaction ? And how they performed

Posted by Manish Rajput 4 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 8 months ago

Aldol Condensation can be defined as an organic reaction in which enolate ion reacts with a carbonyl compound to form β-hydroxy ketone or β-hydroxy aldehyde, followed by dehydration to give a conjugated enone. Aldol Condensation plays a vital role in organic synthesis, creating a path to form carbon-carbon bonds.

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What is dipole dipole moment?

Posted by Manish Rajput 5 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Tanya Gautam 5 years, 1 month ago

Dipole moments occur when there is a separation of charge. They can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity

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Tanya ?? 5 years, 1 month ago

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Which is the best YouTube channel for chemistry XII?

Posted by Tanya Gautam 5 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Sourabh Kumar Sourabh Kumar 5 years, 1 month ago

Solid state

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Monika Bhardwaj 5 years, 1 month ago

Gravity circle is good but videos are lengthy so i also prefer aman dhattarwal

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Tanya ?? 5 years, 1 month ago

Gravity circle is also good.

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Student Of The Year 5 years, 1 month ago

I follow Arvind Arora sir for chemistry..

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Predict the stereochemistry of the product formed of an optically active alkyl halide undergoes substitution reaction by an sn1 mechanism

Posted by Ankur Sonkar 5 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How to study chemistry for long time

Posted by Utkarsh Gupta 5 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Yash Agarwal 5 years, 1 month ago

This is mission impossible

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Devil ? 5 years, 1 month ago

Just enjoy

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Shruti Singh 5 years, 1 month ago

Just study in small portions.. take break in between Chemistry is not that but sometime the reason is i just dont want to study it..we need to overcome that

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Satvikk . 5 years, 1 month ago

Don't Study

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What's is collides

Posted by Akash Pandey 5 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Sher Singh 4 years, 6 months ago

Colliods are those particles which have size in between true particles and suspension i.e. from 1 nm to 1000 nm

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Kanhaiya Maddheshiya 5 years, 1 month ago

This is state in which particle size range is from 1nm to 1000 nm.

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Nitrogen cannot form d pi- d pi bonds. Why?

Posted by Komal Jena 5 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Sher Singh 4 years, 6 months ago

Due to absence of d-orbitals in its valence shell

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Mr. Singh 5 years, 1 month ago

Because of absence of d-orbitals in its valence shell. Here, the multiple bonding is due to p(pi)or p(pi)-d(pi) bonding. The vacant 3d-orbitals of S overlap with the filled 2p orbitals of O.

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How many electron volts make up one joule??

Posted by Mr. Singh 5 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Dinesh Kumar 5 years, 1 month ago

IeV=1.6 *10^-19 J and I J equals 6.2* 10^18 eV..... Thank me later

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What is resonance structure ?

Posted by Manish Rajput 5 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Utkarsh Gupta 5 years, 1 month ago

Resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures into a resonance hybrid in valence bond theory.

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Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.

Posted by Manish Jee 4 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 8 months ago

Two or more cations of lower valency are replaced by a cation of higher valency to maintain electrical neutrality. Hence some cation vacancies are created. For example : In an ionic solid 'NaCl' , is impurity of Sr²⁺ is added (as SrCl²) then two Na⁺ ions left thus lattice sited. To maintain electrical neutrality one lattice site is occupied by Sr²⁺ ion while other lattice site will remain vacant.

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Define collgative properties of dilute solution.

Posted by Ankit Kumar 5 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Utkarsh Gupta 5 years, 1 month ago

Colligative properties of solutions are properties that depend upon the concentration of solute molecules or ions, but not upon the identity of the solute. Colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure

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Elevation in boiling point

Posted by Krishna Soni 5 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Manish Jee 5 years, 1 month ago

The boiling point of a liquid is the temperature at which it's vapour pressure becomes equal to atmospheric pressure . But the vapour pressure of a solution is always lowered due to the addition of non volatile solute.

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Electronic configuration for all sc3+, ti4+, cu+

Posted by Yashu Yashu 5 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

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What is bredig arcs method

Posted by Sreethu Tnair 4 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 10 months ago

Bredig's arc method is a method of preparation of colloidal solution, of metals such as gold, silver or platinum. This method consists of both dispersion and condensation. An arc is struck between electrodes, under the surface of water containing some stabilizing agent such as traces of KOHpotassium hydroxide.

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What is ambient legend

Posted by Arshid .. 5 years, 1 month ago

CBSE > Class 12 > Chemistry