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

Since the solute molecules are non-volatile, the vapour above the solution consists of only solvent (pure liquid) molecules. After adding the solute, the vapour pressure of the solution is found to be lower than that of the pure liquid at a given temperature. This is known as relative lowering of vapour pressure.

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Calculate the amount of oxalic acid H2C2O4.2 H2O required to prepare 220 ml of decinormal solution..(equivalent mass of oxalic acid = 63)

Posted by Anisha Kabsuri 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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The vapour pressure of H2O is 23.756 mmHg at 25oC. What is the vapour pressure of a solution of 28.5 g of sucrose, C12H22O11 (342) in 100 g of H2O?

Posted by Pranav Rajeev 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Ch10

Posted by Deendayal Pandey 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Lalit Kishor 5 years, 8 months ago

What ch 10

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What is vapour pressure? In class 12 comparison

Posted by Vivek Sharma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Kritika Yadav 5 years, 8 months ago

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature

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Vaishali Chaudhary 5 years, 8 months ago

The pressure exerted by the vapour above the liquid surface in equilibrium with the liquid at a given temperature.

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The mixture of n-hexane and n-heptane . Which deviation it will show

Posted by Anuj Verma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Ayush Vishwakarma?? 5 years, 8 months ago

Ideal solution is it

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How the sum of mole fraction is 1 Is there any fact behind this.Please explain

Posted by Preetesh Dubey 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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what is sublimation

Posted by Muskan Sharma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

3 answers

Talib Jamshed 5 years, 8 months ago

The process of converting solid into gas or vice versa

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Yogita Ingle 5 years, 8 months ago

Sublimation is the property of substance in which they are converted directly from solid to gas or vice versa. Such substances are known as sublime. Some examples of solids which sublime are ammonium chloride, camphor, naphthalene and anthracene.

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Anisha Kabsuri 5 years, 8 months ago

Direct change of solid into gas is known as sublimation. For example napthelene balls.

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what is latent heat of energy

Posted by Muskan Sharma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 8 months ago

Latent heat is the amount of heat energy required to change state of 1kg of matter like latent heat of fusion is heat energy required to change state of 1kg of solid into liquid at its melting point. This hidden heat which breaks the force of attraction between molecules and changes the state is known as latent heat.

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why kezia father behave like this

Posted by Muskan Sharma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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A solution containing 1.23g of calcium nitrate in 10g of water, boils at 100.975°C at 760mm hg. Calculate the Von't Hoff factor for the salt at this contraction.

Posted by Vaishali Chaudhary 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Arrange the following in the increasing order of boiling point 0.2m NaOh,0.2m Na2Co3,0.1m AgNo3,0.1m (Nh4)2So4.FeSo4.6H2O

Posted by Vaishali Chaudhary 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Why there is a need to find the concerntration of any solution.if we know amout of solute which is added to solvent?

Posted by Anisha Kabsuri 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Vishwakarma?? 5 years, 8 months ago

Concentration of a solution is called solute there is no need to find the concentration of solution.

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Can we find molarity from molality...?

Posted by Anisha Kabsuri 5 years, 8 months ago

CBSE > Class 12 > Chemistry

5 answers

Sheetal :) 5 years, 7 months ago

m=M divided by 1000*d-M*molecular wt. where m is molality,d is density and M is molarity.

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Ayush Vishwakarma?? 5 years, 8 months ago

Got it na thnq for ask??

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Ayush Vishwakarma?? 5 years, 8 months ago

If only density is given then we can find that because volume =mass /density....then mass of solute is given then find mass of solvent .....

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Anisha Kabsuri 5 years, 8 months ago

How..

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Ayush Vishwakarma?? 5 years, 8 months ago

Yes we can find

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A solution of glucose in water is 10% by weight.calculate molarity.

Posted by Anisha Kabsuri 5 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Ayush Vishwakarma?? 5 years, 8 months ago

Let volume of solution be 100ml

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Ayush Vishwakarma?? 5 years, 8 months ago

1/1.8M

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Diffrence between cp and cv

Posted by Anshu Thapar 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sahil Wadhwa 5 years, 8 months ago

Cp-Specific heat capacity at contant pressure. Cv-Specific heat capacity at constant volume.

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for a reaction to any three after reacting get and 2NH3 + 3 H2 rate equal to k write the order and molecularity of this reaction also write the unit of k that is rate

Posted by Sajal Chakraborty 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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For a first order reaction, show that the time required for 99%completion is twice the time required for the completion of 90%of the reaction?

Posted by Sajal Chakraborty 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Which of the following has least F.P.T? A)1% glucose b)1% sucrose c)1%Kcl d)1% Bacl2

Posted by Vaishali Chaudhary 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is the price of pradeep chemistry for class 12?

Posted by Deepanshu Joshi 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Name the compounds in which oxygen has oxidation state different from-2 Give oxygen State also

Posted by Avesh Khan 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Sheetal :) 5 years, 7 months ago

In peroxide , oxidation state of O2 is -1. Ex.hydrogen peroxide or H2O2 In superoxides, oxidation state of O2 is -1/2.Ex.NaO2

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What is group 17

Posted by Ankit Singh 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Palak Gambhir 5 years, 8 months ago

Halogens (highly reactive) .. Like chlorine.. Florine.. Have valency (-1)

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Predict the major product that would be formed by dehydrogenation of 2-cloro-2methylbutan with potassium in presence of ethanol

Posted by Rijwan Makakmayum 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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When was Weigh and Measure Convention Signed?

Posted by Navin Kumar 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is henry,s law

Posted by Nikhil Chauhan 5 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Student Of The Year 5 years, 8 months ago

Solubility is directly proportional to pressure

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Yogita Ingle 5 years, 8 months ago

Henry’s law

Henry’s Law establishes aquantitative relation betweenpressure and solubility of a gasin a solvent.
This law is for gas-liquid solution.
According to the law at a constant temperature, thesolubility of a gas in a liquid is directly proportional to thepressure of the gas.
It can also be stated as - The partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution.
Mathematically,

p = K_H x where K_H= Henry’s law constant.

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2(ch3)2chcl+2na react in the presence of dry ether

Posted by Shankar Shankar 5 years, 8 months ago

CBSE > Class 12 > Chemistry