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

This is because of lanthanoid contraction.as atomic size decreases from La to Lu hence electropositive nature also decreases and so is the basic character

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Mole fraction

Posted by Anuj Kumar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Suhani Rana? 6 years, 9 months ago

It is the fraction of mole of any component present in a solution

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ANSWER

Why octahedral has more crystal field splitting energy than tetrahedral

Posted by Urvi Nagpal 6 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Sanskriti S 6 years, 9 months ago

I'm not sure about the answer 'cause uts explanation is not given in any book

1Thank You

Sanskriti S 6 years, 9 months ago

I'm giving two explanations: 1.higher the oxidation state of central ion, larger is the value of CFSE. Generally the central ion are in higher oxidation state(+3,+2,..) in octahedral complex and that in lower oxidation state(0,+2,..) in tetrahedral. 2. In octahedral complex there are six ligands and in tetrahedral, there are only four ligands, so repulsion is higher in octahedral, hence it's CFSE is higher.

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Piyush Kumar 6 years, 9 months ago

No. Of ligands are more.

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The solubility of pure Nitrogen gas at 25C and 1atm is 6.8*10^-4mol/L. What is the concentration of Nitrogen dissolved in water under atmospheric conditions? The partial pressure of Nitrogen gas is 0.78 atm.

Posted by Mohit Prasad 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why is PCl3 more covalent than PCl5

Posted by Snehashish Datta 6 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Suhani Rana? 6 years, 9 months ago

But i don't think that pcl3 is more covalent by the way your welcome

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Snehashish Datta 6 years, 9 months ago

It is given in a question paper. Maybe its wrong. Anyways thanks for your help suhani.

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Suhani Rana? 6 years, 9 months ago

Hey actually i think your question is wrong because pcl5 is more covalent then pcp3?..because In pcl3 p is in +3 oxidation state and in pcl5 p is in +5 oxidation state so according to fazan rule higher is the oxidation state more will be the covalent character....

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Are cell reactions from leclanche cells, secondary batteries important???

Posted by Shivam Keshri 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Yashika Moudgil 6 years, 9 months ago

Each and every cell is important with their uses...

3Thank You

Suhani Rana? 6 years, 9 months ago

Yeah..

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ANSWER

What are aromatic amines?

Posted by Pooja Sahoo 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Karan Joshi 6 years, 9 months ago

Benzene ring which contain one amine group are called aromatic amines .

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Chemical reactions asked in last 10 yrs

Posted by Asha Lakariya 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

An element has a body centered cubic structure with a cell edge 288 pm. The density of the element is 7.2g/cm cube. Calculate the no of atom in 208 gram of the element?

Posted by Shivani Sharma 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Shashank Tank 6 years, 9 months ago

We can calculate it by the formula d=into m/a3 into avogadro number

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ANSWER

Why c-cl bond length is smaller than ch3-cl?

Posted by Deepanshu Kumar Singh 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Harshita Panwar 6 years, 9 months ago

As Cl is more electronegative than C

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ANSWER

Starch defined

Posted by Divyansh Rana 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Suhani Rana? 6 years, 9 months ago

It is a polymer of alpha-D-(+)-glucose and consist of two components amylose and amylopectin

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ANSWER

The length of unit cell edge of body centred metal crystal is 352 pm. Calculate the radius of an atom of a metal.

Posted by Harsh Sharma 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Nawal Yadav 6 years, 9 months ago

a = 4r/root 3

1Thank You

Shivangi Mehra 6 years, 9 months ago

Relation isr=a/2

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ANSWER

Ch 5 is boring n lengthy also

Posted by Shahroon Saifi 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Harshita Panwar 6 years, 9 months ago

you can listen song for refreshment

1Thank You

ANSWER

Surface chemistry m kyaa kya pdhna ha

Posted by Shahroon Saifi 5 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Lokesh Ramadas 6 years, 9 months ago

Frendulich isotherm, colloids, lyophilic and lyophobic colloids, coagulation and Hardy-Schzule rule.

0Thank You

Harshita Panwar 6 years, 9 months ago

You can follow NCERT

6Thank You

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Tell me what is Azeotropes

Posted by Shahroon Saifi 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Raghavesh Baskaran 6 years, 9 months ago

Mixture of liquid in both vapour and boiling phase

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Harshita Panwar 6 years, 9 months ago

Mixture of two liquid which boils at constant temperature

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ANSWER

Bhai me bhi physics me shyd he pass hu koi mujhe bta sakta h kie chemistry me ky ky padhna h jisse ham pass tho ho jaynge

Posted by Amar Mote 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Alisha Saini 6 years, 9 months ago

Do ncert ques and learn the defination from all the ch.

1Thank You

A Jaiswal 6 years, 9 months ago

https://www.change.org/p/central-board-of-secondary-education-provide-lenient-correction-for-the-cbse-physics-2019.......bro go and file petition to cbse for lenient correction of physics paper..... ☺

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Bhai physics me to Sayad he pass hu me lekin koi muje bta sakta hai chemistry me kya padna hai PASS hone ke liye plz yarr

Posted by Nikhil Kumar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Lokesh Ramadas 6 years, 9 months ago

NCERT

0Thank You

ANSWER

why matter has so many state

Posted by Rinku Yadav 6 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Atoms of an elements are arrange in cubic crystal lattice edge length of unit cell is 5A ,molecular mass of element 75 and density of solid is 2gram/ cm3 write the nature of cubic crystal lattice

Posted by Abcdefg Hijklmnop 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Sanskriti S 6 years, 9 months ago

bcc ; using d=Z * M/(a^3 * N°), Z=2

3Thank You

ANSWER

What is the formation of DDT???

Posted by Suhani Rana? 6 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Ritik Rohit 6 years, 9 months ago

Chloral CHOCl3

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Hanu Saini 6 years, 9 months ago

P, P, dichloro, trichloro, ethane

3Thank You

Ritik Rohit 6 years, 9 months ago

Condensation of chlorobenzene with chloral CHCl3 in the present of conc H2So4

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ANSWER

Find the osmotic pressure of solution formed by dissolving 6 gram of Urea 18 gram of glucose 34.2 gram of sucrose into 1 kg water

Posted by Durga Nandan 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Sanskriti S 6 years, 9 months ago

total moles of solute, n=(6/60)+(18/180)+(34.2/342)=0.3 ; volume of 1kg water, V=1L ; osmotic pressure = nRT/V=0.3*0.0821*273=6.724atm

1Thank You

Rohit Jain 6 years, 9 months ago

Is it 7.389 atm.

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ANSWER

Numericals kitne aayenge??

Posted by Muskan Singla 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Manish Singh 6 years, 9 months ago

8 or 10 marks

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c2o4 ^2- is strong or weak ligand ?

Posted by Himanshu Thakur 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Suhani Rana? 6 years, 9 months ago

Strong filled ligand

3Thank You

Sanskriti S 6 years, 9 months ago

strong

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Chemistry ki tyaari kesi chal rhi h sabki? Kitna ho gya ?

Posted by Muskan Saxena 6 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Goyal 6 years, 9 months ago

Abhi to start hua hae hamara class 12th ka syllabus.

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Can i get above 95 if i m doing only ncert

Posted by Aryaman Singh Tomar 6 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Hanu Saini 6 years, 9 months ago

Yes it is more than sufficient

1Thank You

Sarthak Jain 6 years, 9 months ago

Paper 70 ka hi hota ha ?

0Thank You

Alisha Saini 6 years, 9 months ago

Yes mujhe to lagta hai ki ncert is Enough for boards

1Thank You

ANSWER

Chemistry in everyday life me kya pdna hai

Posted by Ritik Rohit 6 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

A Sri 6 years, 9 months ago

Atleast 2 examples each of antibiotics,analgesics,etc, the most important ones are drugs,tranqilizers and composition of tincture of iodine and dettol

1Thank You

Divyansh Varshney 6 years, 9 months ago

definitions yaad krlo

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Chemistry ka paper kaisa ayega(cbse) ? a.Easy b.Medium c.Hard

Posted by Pankaj Kumar 6 years, 9 months ago

CBSE > Class 12 > Chemistry