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

DIFFUSION is a process in which transfer of substances takes place from higher concentration to lower concentration and OSMOSIS is that process in which the transfer of solvent takes place from lower concentration to higher concentration through semi permeable membrane.

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Convert propene 1 ol to propane 2 ol?

Posted by Tisha Malviya 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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F.C.C element(atomic mass60) has cell edge of 400pm what is density of unit cell

Posted by Priti Kumari 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Ambar Mallick 7 years, 8 months ago

4×60/Na×(400×10^-10cm)^3 Calculate these u will get your answer?

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Explain +ve deviation and -ve deviation

Posted by Krishan Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Can hydrogen bonding form between ethanol and acetone

Posted by Krishan Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is voids

Posted by Priya Shekhawat 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Lucky Momin 7 years, 8 months ago

Voids literally mean gaps between the constituent particles. Voids in solid states mean the vacant space between the constituent particles in a closed packed structure. Close packing in solids can be generally done in three ways: 1D close packing, 2D close packing and 3D close packing. In 2 dimensional structures when the atoms are arranged in square close packing and hexagonal close packing, we see empty spaces left over between the atoms. These empty spaces are called voids and in the case of hexagonal packing, these voids are in triangular shapes and are known as the triangular voids.

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2-bromo butane is optically active but 1-bromo butane is inactive why?

Posted by Amisha Jaiswal Jaiswal 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sambhav Tyagi 7 years, 8 months ago

Because 2 bromo butane has one chiral carbon . And 1 bromo butane has not chiral carbon . So you know very well that if a compound have one chiral carbon than it is optically active. You can also see by making struct.

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Why NO2 dimerise

Posted by Avni Kaushik 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Sahu 7 years, 8 months ago

It is an odd electron molecule so unstable. Therefore to gain stability it dimerise .

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Aquatic animals are more comfortable in cold water then in warm water. Why?

Posted by Nisha Tomar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Vishwas Sharma 7 years, 8 months ago

Solubility of gas decreases with rise in temperature, as temperature of hot water is high than cold water therefore the solubility of oxygen dissolved in water decreases and there is a deficiency of oxygen in water. So that's why fishes are more comfortable in cold water than hot water.

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Cu2+ +2e-=cu. E0=+0.34V Ag+ +e-=ag (s) E0=+0.80V For what concentration of ag+ ions will the EMF of cell will be 0 . At 25Celsius if concentration of cu2+ = 0.01M

Posted by Katakukutoka Arimotufu 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Kf value for water

Posted by Himanshu Kain 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Ajin Sreekumar 7 years, 8 months ago

1.86 °C

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Whats is soild

Posted by Ankit Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Ambar Mallick 7 years, 8 months ago

The substance whose intermolecular force is high and their constituent particles can not move but oscillates at their mean point

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Mansee Saini 7 years, 8 months ago

Soild is a matter it's molecules are closely packed to each other due to it's high molecular force of attraction

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Abhinav Kalaliya 7 years, 8 months ago

It is one of the state of matter having definite size and volume

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Doping of agcl crystals with cdcl2 results in (a)frenkel defect (b)schottkey defect (c)substitutional cation vacancy (d)formation of f centres

Posted by Manshi Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Uday Pratap 7 years, 8 months ago

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A solution is made by dissolving 30gm of a volatile solution in 90gm of water. It has a vapour pressure of 2.8kpa at 298k. At 298k vapour pressure of pure water is 3.64kpa calculate the molar mass of solute

Posted by Alok Suryavanshi 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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10 ml of conc h2 so4 18M is diluted to one litre . The approximate strength of the dilute acid

Posted by Vinay Janagal 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is concentrated

Posted by Aakansha Patel 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Rishabh Sahu 7 years, 8 months ago

Concentration is high.

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A liquid solution is composed from one mole of A and 1 mole of B it is an ideal solution given vapour pressure of pure A 200 mm of HG and vapour pressure of pure B is 300 mm of HG then calculate total vapour pressure of solution when three by fourth of liquid vapourises

Posted by Sanket Kumar 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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How to indentify ionic and covalent solids?

Posted by Anubhooti Saxena 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Ambar Mallick 7 years, 8 months ago

Ionic solid is made up of ions and covalent solids are formed by covalent bounding of atoms

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Formula of alcohol

Posted by Preetam Dhaka 7 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Alok Suryavanshi 7 years, 8 months ago

C2H5OH

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Anonymous A 7 years, 8 months ago

C2 H 5 OH

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Adarsh Sharma 7 years, 8 months ago

C2h5oh

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Give example each of molecular solid and ionic solid

Posted by Suhail Saifi 7 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Mansee Saini 7 years, 8 months ago

Nacl is the ex. Of ionic solid and H2O is the ex.of molecular solid

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Adarsh Sharma 7 years, 8 months ago

Hcl -molecular solid polar and nh3 , h2o

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Out of the following three solutions which has the highest boiling point and why first 1 Mglucose second 1 MPotassium Chloride III 1 M aluminium nitrate

Posted by Aditi Ojha 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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How to find nearest neighbour of bcc lattice

Posted by Neha Gupta 7 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Ayush Trivedi 7 years, 8 months ago

See how many atoms are touched with it.

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Sarvesh Shukla 7 years, 8 months ago

Firstly let's assume that there is atom at the face-center & Join it to a atom at the corner A to other corner B & as we know the length of AB . Join A to the atom of other corner C passing through the atom placed at the center it will make an right angle triangle's hypotenuse of ABC now find it & now divide it into 4 parts you will get your answer.

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Uday Pratap 7 years, 8 months ago

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What is the hybridization in NO2

Posted by Jaswanthi Kampara 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Umesh Singh 7 years, 8 months ago

Sp2

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How to do better in 12 class if i have not scored good in 11 class? Please tell me

Posted by Tanisha Sharma 7 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Medhavi Singh 7 years, 8 months ago

Just work harder and harder bro ?

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Mansee Saini 7 years, 8 months ago

Do your work daily

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Why hexagonal close packing is more efficient mode of packing than the square close packing

Posted by Rohit Soni 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Prasoon Srivastava 7 years, 8 months ago

Bcoz free spaces r less in hexagonal close packing as compared to square close packing which makes the forces of attraction large in magnitude.

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Property of carbon

Posted by Naman Mittal 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhishek Verma 7 years, 8 months ago

Carbon(fromLatin:carbo"coal") is achemical elementwith symbolCandatomic number6. It isnonmetallicandtetravalent—making fourelectronsavailable to formcovalentchemical bonds. It belongs to group 14 of the periodic table.[13]Threeisotopesoccur naturally,12Cand13Cbeing stable, while14Cis aradionuclide, decaying with ahalf-lifeof about 5,730 years.[14]Carbon is one of thefew elements known since antiquity.

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Why glass considered as a supercooled liquid

Posted by Yashi Aggarwal 7 years, 8 months ago

CBSE > Class 12 > Chemistry