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

Given V.P of pure water= 80mm Hg Mass of water= 90 grams Mass of urea = 15 grams Soln- From Raoult's law V.P of soln= V.P of pure liquid x Xsolvent = V.Pliquid x moles of solvent/ moles of solute + moles of solvent = 80 x 5/0.25 + 5 = 80 x 0.95 = 76mm Hg Hence, the V.P of soln. is 76mm Hg I hope its Helpful... ?

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Jannat Khan 6 years ago

Pta ho toh bta dijiye

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Jannat Khan 6 years ago

M is saal 12th m aayi hu mujhe 1 question m prb aa rhi thi

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Jannat Khan 6 years ago

Pr abhi aayi hu 12th m bahiya

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Lalit Dubey 6 years ago

Maths padho ab

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Lalit Dubey 6 years ago

Chemistry ka paper ho gya h tab bhi chem leke bethi ho

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reaction cyclohexanone with methanol gives?

Posted by Corazon Sama 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Shreya .. 6 years ago

1 methoxy cyclohexanol

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ANSWER

How to fast solve the reactions

Posted by Brajesh Baghel 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 6 years ago

Sabse phle mechanism samjho fir reagent ka function fir speed apne app aa jayge

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ANSWER

Q.comman name of this CH3 compound | CH--CH2--CH3 | CH3

Posted by Mamdeep Rohilla 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Suraj Kumar 6 years ago

Methyl

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ANSWER

Glucose doesn't give 2,4 dnp test

Posted by Puuu Okey 6 years ago

CBSE > Class 12 > Chemistry

1 answers

? ? 6 years ago

Bcoz it exist in ring form....

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ANSWER

Vapour pressure of CHCL3 and CH2CL2 are 200 mm of Hg and 415 mm of Hg. Calculate the vapour pressure of the solution if it is prepared by mixing 25.5 g of CHCL3 and 40g of CH2CL2 . What is the mole fraction of each component in vapour pressure

Posted by Abhinav Tomar 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Amrit Amrit 6 years ago

Ncert ka question h Is app me bhi solution diya h dekh lo

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ANSWER

Write nomenclature for Na2(z n(cN)4

Posted by Sampreeth Bs 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years ago

Its name is sodiumtetracyanozincate(II)

Explanation:

Zinc is a part of anion so... Suffix ate is added and II is its for +2 charge on it.. Cyano can also be written as cyanido is a ligand and 4 cyanide is present so tetra prefix is added

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ANSWER

Is chapter solid state has been removed from 12th board syllabus??

Posted by Jatisha . 6 years ago

CBSE > Class 12 > Chemistry

4 answers

Shreya Chaudhary 6 years ago

Yes

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Rangat Kaur 6 years ago

Yes

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Tamanna Sharma 6 years ago

Ye chapter cbse ke syllabus se to cut chuka he lekin sayad state board me he, agar tum state board se ho to ekk bar check kar lo kyoki yha 95% students cbse se he aur 5% state board se bhi

2Thank You

Rajput Boy 6 years ago

Yes

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ANSWER

If activation energy is zero then rate constant will depend on temperatur?

Posted by Aarif Khan 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 6 years ago

Actually it is not practically possible that for a reaction activation energy is o, but if theoretically poosible the acc to arrhenius equation rate constant is not depends upon temp as activation energy is o

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ANSWER

Can electron and nucleus of atom collide when we press any object too much? If yes, then what will happen, can that object destroy?

Posted by Ayush Kumar 6 years ago

CBSE > Class 12 > Chemistry

2 answers

Ayush Kumar 6 years ago

Happy holi

1Thank You

Tamanna Sharma 6 years ago

Acc to quantum physics and nuclear chemistry no matter destroy as it always changes its state ( consider as wave) high level or low energy levels in pressing apply wave superposition resulting in constructive and destructive ( have to overcome barrier energy then able to form antiparticle ............this is from my point of view if any other reason then please tell me also? happy holi

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Solid state chap. Hai?? 12 me

Posted by Rahul Yadav 6 years ago

CBSE > Class 12 > Chemistry

2 answers

Prakash Kumar 6 years ago

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Sneha Jain 6 years ago

Nhi h.. pr ab kyu puchh rhe ho ?? Paper toh go gya

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i am expecting 25-26 marks hardly in chemistry 2020 ....i am worried...teacher will give more marks or less????

Posted by Aman Karak 6 years ago

CBSE > Class 12 > Chemistry

9 answers

Amrit Amrit 6 years ago

Depends on teacher If they also have same sitution as your in class 12 And, they don't get expected marks He/She will not going to give you a single extra marks...? A True reality !

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Prakash Kumar 6 years ago

Ek baat or teachers marks dene k liye rehte hai full support karenge wo

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Prakash Kumar 6 years ago

Jo kharab chala gaya rehne do aage wale exams acche se krna taki % increase ho sake

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Mahesh M 6 years ago

Less

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Ďãřşháñăã Yadav ? ? ? 6 years ago

mill jayenge marks don't take tension

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Řøhăň Řąjpůť ✌️✊ 6 years ago

tu aur usay tane de le. ????

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Kavish Bhardwaj 6 years ago

Yaar chemistry ka to easy tha physics tough tha agar chemistry mein hi yeh haal hai to physics to.....

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Řøhăň Řąjpůť ✌️✊ 6 years ago

extra marks mill jayenge. don't worry

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Shivam Dhakre 6 years ago

Me only 20 to 22

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ANSWER

sir checking of cbse 2020 chemistry is leniant or hard??

Posted by Aman Karak 6 years ago

CBSE > Class 12 > Chemistry

2 answers

Lakshya ? 6 years ago

Hard

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Gaurav Rawat 6 years ago

Hard

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ANSWER

Difference between absorption and adsorption ?

Posted by Harini Anubaratham 6 years ago

CBSE > Class 12 > Chemistry

1 answers

Varun Dhawan 6 years ago

Adsorption is a surface phenomenon whereas absorption is a bulk phenomenon

1Thank You

ANSWER

x and y are two electrolytes on dilution molar conductivity of X increases 2.5 X that why increases 25 x which of the two is weak electrolyte and why

Posted by Jyothi Venkatesh 6 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Mai thoda late ho gya. ??? fir bhi paper kesa gya... ??

Posted by Řøhăň Řąjpůť ✌️✊ 6 years ago

CBSE > Class 12 > Chemistry

2 answers

Řøhăň Řąjpůť ✌️✊ 6 years ago

maine pucha kesa gya feedback manga hai vo toh mujhe bhi pta hai paper in over

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Abc ?⏳ 6 years ago

Paper is over.....?

1Thank You

ANSWER

Kya all india set 1,2,3 same rahte hai ki alag alag region wise?

Posted by Pushkar Gupta 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Aman Sharma 6 years ago

you are right

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Mahesh M 6 years, 1 month ago

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Pushkar Gupta 6 years, 1 month ago

Lekin cbse guide me laat year 2019 ke sirf 3 hi diya hai

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Pushkar Gupta 6 years, 1 month ago

Okk thanks

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Shreya .. 6 years, 1 month ago

They are different...maybe state wise

1Thank You

ANSWER

Is methylene a lewis acid...?

Posted by Shreya .. 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Rajat Barwar 6 years, 1 month ago

Due to incomplete octet and empty orbital.

2Thank You

Rajat Barwar 6 years, 1 month ago

If you mean carbene then, YES.

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ANSWER

Koi aisa v hai jiska chemistry ka exam Acha nii hu aa?

Posted by Mandeep Kaur 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Ankan Rastogi 6 years ago

Nice thought

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Mandeep Kaur 6 years, 1 month ago

Thnks alot..?

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Abc ?⏳ 6 years, 1 month ago

See if u're still worried about chem....so u hv to leave that.....so that its impact shouldn't be on remaining exams.....u should focus on other exams so as to gain max marks which u may lose bcz of chem......not only u there are many whose chem is weak.....all the students aren't topper..... don't give up.....all the best for next ????

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ANSWER

Out of kI or K2 SO4 which electrolyte is better in coagulation of positive sol

Posted by Komal Dhaliwal 6 years, 1 month ago

CBSE > Class 12 > Chemistry