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

Negative deviation- In a non-ideal solution the intermolecular forces between the solute-solute particles and the intermolecular forces between solvent - solvent particles is less than of the intermolecular forces between solute - solvent particles

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Ujjawal Yadav 6 years, 7 months ago

Yes Simply U Can Also Tell That A Pressure between A B Will Low Than The Calculated VP By R... law

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Nishu Sahu 6 years, 7 months ago

-ve deviation is a type of non ideal solution when the observed vapour pressure of solution is lower than the calculated vapour pressure( by raults law) of the solution.

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What is buffer solution and how to find it??

Posted by Jayaasrii?? Jayaasrii 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 7 months ago

Acidic buffers are solutions that have a pH below 7 and contain a weak acid and one of its salts. For example, a mixture of acetic acid and sodium acetate acts as abuffer solution with a pH of about 4.75.

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What is meant by corrosion

Posted by Uday Pratap Rajput 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Dindayal Rqthur 6 years, 7 months ago

Corrosion is process by which an active oxide layer is form at the surface of metal which eat the metal

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Jyoti Mahato 6 years, 7 months ago

Corrosion is a chemical reaction in which metal react with atmospheric moisture and oxygen gas to form metallic oxides.

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zinc rod is dipped in 0.1 normality solution of zn s o4 the salt is 95% dissociated at this solution at 298 Kelvin calculate the electrode potential

Posted by Prakarsh Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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The order of reaction is half .Calculate the concentration increased ,so that the rate of reaction becomes 2.5 times to that of initial rate .

Posted by Faisal Khan 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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Find the product of electrolysis of molten in presence of pletanium electrode . Cu(no3)2, Cuco3. Znso4

Posted by Ayush Kumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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When will be chemistry improvement exam

Posted by Rajeev Verma 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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Structure of 1bromo 4sec

Posted by Mausam Yadav 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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Kya marks ka distribution chapter wise hota h or is it given by cbse

Posted by S.....Sharma☺??? .. 6 years, 7 months ago

CBSE > Class 12 > Chemistry

4 answers

Dindayal Rqthur 6 years, 7 months ago

No it is not chapter wise but unit wise

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Aastha Saxena 6 years, 7 months ago

It's by given by CBSE chapter wise

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Rajashekhar Doshetty 6 years, 7 months ago

Haa its given by cbse in the last page of ncert

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Bhavya Tiwari 6 years, 7 months ago

Distribution by chapter content.

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E°red of different half cells are given as E°Cu2+/cu=0.34v

Posted by Abhishek Sahu 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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A solution prepared by dissolving 1.25gm of oil of wintergreen in 99gm of Benzene as a boiling point of 80.31*C. Determine the moleculer mass of this compound. Boiling point of pure Benzene = 80.01 and kb for water = 2.53*c k kg mol*-1.

Posted by Jayant Chandra 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Pragati Gola 6 years, 7 months ago

∆tb=kb×wB/mB×wA(kg), ∆tb=tb-t°b, ∆tb=80.31-80.01=0.30K

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Why are aquatic species more comfortable in cold water rather than in hot water?

Posted by Macherla Indupriya 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Dindayal Rqthur 6 years, 7 months ago

As increase in temp kinetic energy of gas partial essentials for life increas so tendency of gas partical to escape from liquids increase ,solublity is decreas .chance For survive also decreas

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Sinchana Malagond 6 years, 7 months ago

aquatic species are more comfortable in cold water rather than in hot water because as temperature decreases, solubility increases.Solubility of oxygen increases at low temperature therefore the aquatic species are more comfortable.

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find the number of moles of nitrogen gas and hydrogen required for the preparation of 112 litres of NH3 gas at STP

Posted by Priyatam Shankar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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find the number of nucleons in 1 gram of boron

Posted by Priyatam Shankar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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When the temperature increase surface tension of water

Posted by Ayush Kumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

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What does the 'n' denote in huckle's rule?

Posted by Shobikaa Ravikumar 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

S.....Sharma☺??? .. 6 years, 7 months ago

I think n is denoted the fused benzene ring

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Sinchana Malagond 6 years, 7 months ago

Endnotes the number of Pi bonds

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Solutions of ncert intext questions

Posted by Dhiraj Singh 6 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhay Raghuvanshi 6 years, 7 months ago

See from a book

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What is hennarys law

Posted by Zeba Malik 6 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Dindayal Rqthur 6 years, 7 months ago

According to hennry law partial pressur above the surface of liquid ids directely prportional to mole fraction of gas partical present in liquid

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Gaurav Seth 6 years, 7 months ago

Henry’s law states that the solubility of a gas in a liquid is directly proportional to pressure of the gas; temperature constant.

Mathematically, P = K_H x

where
x=mole fraction of gas in solution
P is partial pressure of gas,
K_H is Henry's constant.

Applications:

(1) Henry's law finds various applications in industry and enables us to explain and understand some biological phenomena. The some of important applications are : CO₂ solubility in soft drinks, beverages, soda water etc. is increased by applying high pressure and bottles are sealed under high pressure.

(2) For deep divers, oxygen diluted with less soluble He gas is used as breathing gas and it minimises the painful effects due to higher solubility of N₂ gas in blood.

(3) In lungs, where oxygen is present in air with high partial pressure, haemoglobin combines with O₂ to form oxyhaemoglobin. In tissues where partial pressure of O₂ is low, oxyhaemoglobin releases the oxygen for utilisation in cellular activities.