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 5 years, 9 months ago

Pta ho toh bta dijiye

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Jannat Khan 5 years, 9 months ago

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

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Jannat Khan 5 years, 9 months ago

Pr abhi aayi hu 12th m bahiya

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Lalit Dubey 5 years, 9 months ago

Maths padho ab

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Lalit Dubey 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Shreya .. 5 years, 9 months ago

1 methoxy cyclohexanol

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ANSWER

How to fast solve the reactions

Posted by Brajesh Baghel 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 9 months ago

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

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

Posted by Mamdeep Rohilla 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Suraj Kumar 5 years, 9 months ago

Methyl

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ANSWER

Glucose doesn't give 2,4 dnp test

Posted by Puuu Okey 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

? ? 5 years, 9 months ago

Bcoz it exist in ring form....

1Thank You

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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Amrit Amrit 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 9 months 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

2Thank You

ANSWER

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

Posted by Jatisha . 5 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Shreya Chaudhary 5 years, 9 months ago

Yes

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Rangat Kaur 5 years, 9 months ago

Yes

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Tamanna Sharma 5 years, 9 months 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 5 years, 9 months ago

Yes

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ANSWER

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

Posted by Aarif Khan 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Ayush Kumar 5 years, 9 months ago

Happy holi

1Thank You

Tamanna Sharma 5 years, 9 months 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

2Thank You

ANSWER

Solid state chap. Hai?? 12 me

Posted by Rahul Yadav 5 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Prakash Kumar 5 years, 9 months ago

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Sneha Jain 5 years, 9 months ago

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

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ANSWER

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

Posted by Aman Karak 5 years, 9 months ago

CBSE > Class 12 > Chemistry

9 answers

Amrit Amrit 5 years, 9 months 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 5 years, 9 months ago

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

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Prakash Kumar 5 years, 9 months ago

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

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Mahesh M 5 years, 9 months ago

Less

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Ďãřşháñăã Yadav ? ? ? 5 years, 9 months ago

mill jayenge marks don't take tension

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Řøhăň Řąjpůť ✌️✊ 5 years, 9 months ago

tu aur usay tane de le. ????

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Kavish Bhardwaj 5 years, 9 months 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 ✌️✊ 5 years, 9 months ago

extra marks mill jayenge. don't worry

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Shivam Dhakre 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Lakshya ? 5 years, 9 months ago

Hard

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Gaurav Rawat 5 years, 9 months ago

Hard

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ANSWER

Difference between absorption and adsorption ?

Posted by Harini Anubaratham 5 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Varun Dhawan 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

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

Posted by Řøhăň Řąjpůť ✌️✊ 5 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Řøhăň Řąjpůť ✌️✊ 5 years, 9 months ago

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

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Abc ?⏳ 5 years, 9 months 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 5 years, 9 months ago

CBSE > Class 12 > Chemistry

5 answers

Aman Sharma 5 years, 9 months ago

you are right

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Mahesh M 5 years, 9 months ago

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Pushkar Gupta 5 years, 9 months ago

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

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Pushkar Gupta 5 years, 9 months ago

Okk thanks

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Shreya .. 5 years, 9 months ago

They are different...maybe state wise

1Thank You

ANSWER

Is methylene a lewis acid...?

Posted by Shreya .. 5 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Rajat Barwar 5 years, 9 months ago

Due to incomplete octet and empty orbital.

2Thank You

Rajat Barwar 5 years, 9 months ago

If you mean carbene then, YES.

2Thank You

ANSWER

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

Posted by Mandeep Kaur 5 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Ankan Rastogi 5 years, 9 months ago

Nice thought

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Mandeep Kaur 5 years, 9 months ago

Thnks alot..?

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Abc ?⏳ 5 years, 9 months 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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Out of kI or K2 SO4 which electrolyte is better in coagulation of positive sol

Posted by Komal Dhaliwal 5 years, 9 months ago

CBSE > Class 12 > Chemistry