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

It is a process of concentrating an ore by dissolving it in a suitable solvent. Here the ore gat dissolved in teh solvent and the gaunge is left behind, the dissolved ore is then extracted by different processes.☺

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Calculate the mass of urea required in making 2.5kg of 0.25 molal aq solution

Posted by Durgesh Dhurve 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is osmotic pressure

Posted by Subham Rana 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Avanshika Saini 7 years, 3 months ago

The pressure applied to prevent osmosis.

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Kiara Khurrana 5 years, 8 months ago

tera face mein hota hai osmotic pressure

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Magnetic moment of (mncl4)2- is 5.92 BM explain

Posted by Yashi Khera 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yashi Khera 6 years, 11 months ago

Jb m marungi muh hi nhi rhega magnetic moment to chod

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Kiara Khurrana 5 years, 8 months ago

muh mein aisa marugi ki muh kka magnetic moment nikalana padega

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What is difference between primary valency and secondary valency

Posted by Ritika Chhapola Ritika 4 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 6 months ago

The primary valency in coordination compounds is the number of negative ions which are equivalent to the charge on the metal ion. The secondary valency is the number of ions of molecules that are coordinated to the metal ion or it is the number of ligands attached or coordinated to metal ions.

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Chemistry blue print

Posted by Jv Jv 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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What is coloids

Posted by Manish Patel 7 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Somya Saxena 7 years, 3 months ago

Soln in which particle exist between the range of 1000 to 1lakh nanometers

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Aman Attitude 7 years, 3 months ago

Colloids are the mixture of two elements

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Anjana Sherawat 7 years, 3 months ago

Solution in which particles size is in between 1nm to 1000 nm is called colloidal solution

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The mole fraction of benzene in tolerene is 0.50 calculate mass % of benzene in solution

Posted by Karan Rajpoot 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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How can we calculate the no. Of electrons when reaction is given .???

Posted by Shruthi Mohan 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Shruthi Mohan 7 years, 3 months ago

Plzz reply soon

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Structure Tri-n-butyl benzyl ammonium chlorid

Posted by Harsh Pal 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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Packing efficiency of fcc structure is 74%

Posted by Akarshita Roy 7 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Bhavani D S Bhavani D S 7 years, 3 months ago

Yes

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Princesses Kaur 7 years, 3 months ago

?????

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Sanjit Ragunathan 7 years, 3 months ago

Yes

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Piyush Kumar 7 years, 3 months ago

Yes

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A first order reaction has a rate constant of15÷1000sec .how long will 5.0g of this reactant take to reduce to 3.0g?

Posted by Priyal Rathi 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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First ionization energies of 5d elements are higher than those of 3d and 4d element?

Posted by Sharad Kumar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Ravi Yadav 7 years, 3 months ago

Bcz in 5d series f block elements enter which has high ionisation enthalpy

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What is the role of NaCN in extraction of silver???

Posted by Aryan Rajput 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Nuke 7 years, 3 months ago

It is used as a suitable solvent to disolve metals like sinver and gold.

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What is collector

Posted by Snehil Sharma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Snehil Sharma 7 years, 3 months ago

That's help to increase the adsorption of the metal on froth

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How can we calculate number of solute particles in van't hoff factor...?? plzz reply soon

Posted by Shruthi Mohan 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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How can we calculate no. Of electrons (n) in gibbs free energy change in an electrochemical cell ..?? Plzz reply soon

Posted by Shruthi Mohan 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Shruthi Mohan 7 years, 3 months ago

If there is any reaction given , then how can we calculate the no. of electrons .??

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Princesses Kaur 7 years, 3 months ago

G =-N f E'

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What is the vant hoff factor

Posted by Mamta Kajla 7 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Shruthi Mohan 7 years, 3 months ago

Van't hoff introduced the van't hoff factor for solute which undergoes association & dissosiation. It is denoted by I . I= 1+ (n-1) alpha Alpha = degree of dissociation n = no. Of solute particles

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Jeevan J 7 years, 3 months ago

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Low of gravition

Posted by Raj Shaikh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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On heating ammonium dichromate give rise to a gas which on treatment with magnesium ribbon give a white solid on dissolving white solid in water another gas X is evolved it gives white fumes when a rod dipped in concentration HCl is brought in its contact identify the gas X and give the reaction involved

Posted by Anmol Pandhu 7 years, 3 months ago

CBSE > Class 12 > Chemistry

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Why standard electrode potential value of SHE is zero

Posted by Veena Veena 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Mahak Garg 7 years, 3 months ago

It is so because it has been set convention for comparison of standard electrode potential of other elements

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What is catalyst?

Posted by Shailendra Kumar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

Catalyst is a substance which can change (enhance) the speed of a chemical reaction without itself undergoing any change in its mass and chemical composition. And the phenomena is called Catalysis.

Homogeneous Catalysis:When the reactants and catalysts are in the same physical state i.e. catalyst is in the same phase as the reactant is called homogenous catalysis.
Heterogeneous Catalysis:A catalytic process in which the catalyst and the reactants are in different phases is called heterogeneous catalysis. This process is also known as surface catalysis or contact catalysis.

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What is Grignard reaction?

Posted by Rahul Kumar 7 years, 3 months ago

CBSE > Class 12 > Chemistry