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

Yarr prblm kya hai tumhari....sidhe muh baat toh kar le ..itna ego ...kyu .....puccha batana hai bata varna koi nahi....socha aman jaisa hoga. ...par nahi bus gussa toh nak par baitha hai ...

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

tumhe kya lena Dena meri hight se... kya ye question exam mein ayega. ?

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

mujhe pta hai tum jhooth bol ri ho.

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Rohan tum kitni aasani se ullu bante ho...?? ...sorry agar Bura Laga toh...tumhari height kitni hai.... please bataona ..

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

ohh kuch seekh lo uss se baat kese kerte hai logo se

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Vese agar koi pucche mere behaviour ke bare mai toh tum kya ray doge.....??

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Mai Niharika nahi hu ....vo meri school friend hai....??... Rohan mai jo bhi kehti hu pata nahi tum kya sochte ho ....

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

itna faltu nhi hoon Jo ye socho.

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Kise wrong bola bhai....kisi ko nahi...tum hi socho jab bhi mai aati hu niharika gayab...aisa kyu kabhi socha nahi ..

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Bhai kuch nahi....tum nahi samajaoge agar samajaya bhi toh...

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

kya mtlb?

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Pata hai, actually main tumhe check kar rahi thi....ki tumhe alag alag kaise identification aata hai...

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

kisi se baat kese kerte hai seekh ker aao pehle.

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Kyu karu apne words ko mind....galti meri nahi hai....

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

shut up mind ur Words kisi ke bare mein aesa bolte hue tumhe ajeeb nahi lagta... I am praising her becoz she had answer number of questions here.

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Niharika makhan lagati hai tumhe ... aur mai sach bolti hu phark bus itna hai ..... Tumne apne mind mai yahi rakha hai ki Mamta humesha negative hi bolti hai....??

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Mujhe sab kuch yaad rehta hai...tum mere aur Niharika ke beech kyu bole. .... Vese tareef kar rahe the iski...aisa toh kya hai.?? ?

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

Jo bolti ho yaad rekha kero kya bola hai.

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Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

kyuki tumne pehle comment kiya tha usay.. that's why. ??

0Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Nahi bantii,. Sahi hai?....nahi banti meri bhi iske saath??, anyways tum mere baare Mai kyu puch rahi ho??

1Thank You

? Natasha Yadav? 6 years, 4 months ago

Oh i don't know about her, Srishti was telling that she is aggressive but kind hearted

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

pta ni mujhe utna uske bare mein but vo bahut aggressive hai user hai yaha ki.. baat baat par ghussa ho jaati hai.. meri nhi banti usse. ? ? iseliye don't know much about her

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? Natasha Yadav? 6 years, 4 months ago

May i ask who is Mamta if you don't mind.

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Srishti Choudhary ✍⏳ 6 years, 5 months ago

Achaa g...?..ohk

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

g nhi aesa bilkul nhi hai.. maine sub kuch report kiya tha.... but main chez hide ho gyi. I am thankful for that. ??

1Thank You

Srishti Choudhary ✍⏳ 6 years, 5 months ago

Ya..u r right..ye bnda h hi talented, unique vgare vgare... M.i right Mr Champ..?

1Thank You

? Natasha Yadav? 6 years, 5 months ago

You are right, i think he is stupid( smart, talented, unique ,person, in, demand) or may be kept for her only so that she come to know that they were talking of her, but she even can't see it.

2Thank You

Srishti Choudhary ✍⏳ 6 years, 5 months ago

Toh inko bhi report kr dete...mne kr diya...isse bhi pta lg rha h ki tum kiski baat kr rhe ho...

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Řøhăň Řąjpůť ✌️✊ 5 years, 8 months ago

g mera alava aur kon karega. ??

2Thank You

Řøhăň Řąjpůť ✌️✊ 5 years, 8 months ago

? ? na bhai usay bhai ki zarrort nhi uske already 2 bade bahi bhai hai. ? ? so mera koi kaam nhi. ? ?

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Řøhăň Řąjpůť ✌️✊ 5 years, 8 months ago

thank God everything is reported... vo jaan le leti meri. ? ? ?

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Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

➡️ 100mL of 0.5M CH3COOH contains CH3COOH =0.05 mol. ➡️ after adsorption, CH3COOH remained =0.049mol ➡️ acetic acid adsorbed =0.001mol=6.02*10 ^20 molecules ➡️ surface area of charcoal adsorbed by each molecule =3.81*10²m²/6.02*10^20 =5*10^-19m²

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ANSWER

2 gases P nd Q decolourise aq. Bromine but only one of them gives a white ppt. with aq. ammonical silver nitrate. P nd Q likely to be?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

since both P nd Q decolourise aq. Br2 soln. therefore both are unsaturated. since, one of them gives a write ppt. with ammonical AgNO3 soln. while the other doesn't one of them is terminal alkyne (but - 1-yne) while the other is non terminal alkyne (but - 2-yne).

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ANSWER

solid state is really deleted

Posted by Simran Kaur 6 years, 5 months ago

CBSE > Class 12 > Chemistry

8 answers

Tanvi Toor 6 years, 5 months ago

Yes

1Thank You

Ujndjiioe Jnjeeijn 6 years, 5 months ago

Yes , from cbse board solid state is deleted

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Aditya Mathur 6 years, 5 months ago

Yes solid state is deleted

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? Natasha Yadav? 6 years, 5 months ago

Yes hundred and one %.

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Rahul_ Ry(ʘ‿ʘ) 6 years, 5 months ago

✌️Yeah!?

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Srishti Choudhary ✍⏳ 6 years, 5 months ago

Ye..its deleted..bt only 4 board..not 4 other exams...

0Thank You

Tanvi Toor 6 years, 5 months ago

Yes it is deleted

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Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

yes it is deleted but u have to prepare this chapter for competitive level like JEE, neet and aiims.

2Thank You

ANSWER

Explain . mechanism of micelle formation?

Posted by Priya Priya 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Gursharn Kaur 6 years, 5 months ago

Micelle formation works on two turns one is hydrophobic and another one is a hydrophilic hydrophobic molecules are those molecules or we can see a part of molecules which gets repaired one comes in contact with the water molecules and hydrophilic molecules can be defined as the part of a molecules which gets attracted towards the water molecule

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Yogita Ingle 6 years, 5 months ago

Mechanism Of Micelle Formation-

Soap is the sodium or potassium salt of fatty acid and may be represented as RCOO^-Na (e.g. sodium stearate, (CH₃(CH₂)16COO^-Na⁺]) . Whendissolved into water , it dissociates into RCOO^- and Na⁺ ions.
The RCOO^-ion consists of two parts – long hydrocarbon chain (also called non – polar tail) which is hydrophobic (water repelling ) and a polar group COO^- (polar head) which is hydrophilic (water loving )

At higher concentrations(CMC) RCOO- ions form an aggregate of spherical shape with the hydrocarbon chains pointing towards the centre and the COO- part facing outward on the surface of the sphere. This aggregate is called ionic micelle. It may have as many as 100 ions

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ANSWER

Conversion of toulene to t.n.t .

Posted by Rahul_ Ry(ʘ‿ʘ) 6 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Rahul_ Ry(ʘ‿ʘ) 6 years, 5 months ago

?% correct answer..... So you won my gratitude..... Thank you....✌️

1Thank You

? Natasha Yadav? 6 years, 5 months ago

If you require detailed explanation , please tell me.

3Thank You

? Natasha Yadav? 6 years, 5 months ago

Toluene when heated with HNO3 and H2SO4 give tnt. When heated at temperature 30°C -40°C give mononitrotoluene. At 60°C forms 2,4-dinitrotoluene. At 90°C forms 2,4,6-trinitrotoluene.( TNT) . In each step presence of HNO3 and H2SO4 is required.

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ANSWER

calculate the current strength in ampere required to liberated oxygen gas at the rate of 1cm²/sec at stp

Posted by Harshat Asangi 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Principle of ellingam daigram

Posted by Kanak Sharma 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Shivam Chaurasia 6 years, 5 months ago

Which metel oxides can be reduced at certain temperature at which gibbs energy bevome very negative for spontaneity.

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ANSWER

What is the principle of ellingam daigram

Posted by Kanak Sharma 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

An Ellingham diagram is a graph showing the temperature dependence of the stability for compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulfides.

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ANSWER

Why Os show +8 oxodation state?

Posted by Mohit Hurmade 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

P-nitrophenol, ethanol, phenol(acidic characters) . Arrange the following compounds in increasing order of the property indicated

Posted by Kamlesh Kumar 6 years, 5 months ago

CBSE > Class 12 > Chemistry

4 answers

Abhishek Kumar Yadav 6 years, 5 months ago

P-nitro phenol >phenol >ethanol

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Kamlesh Kumar 6 years, 5 months ago

Very nice paper

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? Natasha Yadav? 6 years, 5 months ago

All the best for today's test. Hope you will do good. Please reply me afterwards that how was your test.

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

Electron withdrawing group such as - No2 increases the acidic character while electron releasing group such as - CH3 decreases the acidic character. moreover the phenoxide ion produced by loss of Proton by phenol is stabilised by resonance due to delocalisation of negative charge on benzene ring. Therefore increasing oder of acidic character is ethanol >phenol >p-nitrophenol

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ANSWER

Hydronotation of propene and then oxidation to propanol

Posted by Kamlesh Kumar 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Kamlesh Kumar 6 years, 5 months ago

Also the equation with all step and reagents

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ANSWER

Paper pattern changed class 12 chemistry????

Posted by Sanyam Dubey 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

u can easily download it from Google.

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Priya Dharshini ? 6 years, 5 months ago

20 questions are objectives and there are many internal choices between all marks questions... then remaining is same only..

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ANSWER

3-chloro-5-fluoro-3,5-dimethylheptane structure

Posted by Satyam Singh 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 5 months ago

CH3-CH2-C (Cl ^CH3 )-CH2-C(F CH3) - CH2-CH3

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ANSWER

State raoult 's law for solution of volatile liquid. Taking suitable examples explain the meaning of positive and negative deviation from raoults law and draw graph

Posted by Kamlesh Kumar 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why alternating current is used for measuring resistance of an electrolytic solition..??

Posted by Priya Dharshini ? 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Priya Dharshini ? 6 years, 5 months ago

Ohh okay got it... thank you?

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

it is done becoz in case of achievement there is no polarisation due to discontinuous flow of current .

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ANSWER

Calculate the standard cell potentials of galvanic cell in which the following rxns take place::1.2Cr +3Cd2+------2Cr3+ + 3Cd 2..Fe2+ + Ag+ + ------ Fe3+ + Ag...?

Posted by Srishti Choudhary ✍⏳ 6 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Srishti Choudhary ✍⏳ 6 years, 5 months ago

No..its completed...ncert ques h ye

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Nishu Sahu 6 years, 5 months ago

Hy Srishti , is que incomplete

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ANSWER

Conc.H2SO4 is 98% by mass and has density of 18.4gcm-3 .What volume of conc. Acid is required to make 5.00 litre of 0.5 M H2SO4 solution..?

Posted by Chetna Sahu 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Explain azeotrope

Posted by Dip Das 6 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 5 months ago

Binary mixture that have the same composition in liquid and vapour phase and boil at constant temp. like pure liquid are called azeotrope

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? Natasha Yadav? 6 years, 5 months ago

Liquid mixtures which boli at constant temperature without changing in its composition.

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Ajeet Kumar 6 years, 5 months ago

A binary liquid mixture having same composition in liquid and vapour phase and boils at constant temperature is called azeotropic mixture

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ANSWER

Explain hoffmann ammonolysis reaction.

Posted by Ansh Preet 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Calculate the current strength in amperes required to liberate oxygen gas at the rate of 1 cm3/sec at stp

Posted by Ramu Mirji 6 years, 5 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

In the process of calcination,carbonate is decomposed on heating to give metal oxide and??

Posted by Subodh Kumar Singh 6 years, 5 months ago

CBSE > Class 12 > Chemistry

3 answers

Abhishek Kumar Yadav 6 years, 5 months ago

Co2

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Shivam Chaurasia 6 years, 5 months ago

Co2.

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? Natasha Yadav? 6 years, 5 months ago

Carbon dioxide

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ANSWER

What is collision theory of chemical reactions?

Posted by Adwitha Nair???‍??‍? 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Shivam Chaurasia 6 years, 5 months ago

Whenever two molecules causing effective collision with each other then bond breaking and making take place , causing transformation of reactants into products.

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ANSWER

What are colloidal

Posted by Jasvinder Atwan 6 years, 5 months ago

CBSE > Class 12 > Chemistry

1 answers

Tannu Madaan 6 years, 5 months ago

Size of particles between 1nm to 10 nm

3Thank You

ANSWER

What is oxymercuration demercuration ( OMDM) ?

Posted by ? Natasha Yadav? 6 years, 5 months ago

CBSE > Class 12 > Chemistry

4 answers

? Natasha Yadav? 6 years, 5 months ago

Can you answer this @S.Priya.

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Priya Dharshini ? 6 years, 5 months ago

Oh tnq...

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? Natasha Yadav? 6 years, 5 months ago

Alcohol, phenol and ethers.

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Priya Dharshini ? 6 years, 5 months ago

From Which chapter is this question ?

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ANSWER

Calculate the mass of compound (molar mass =256gm/mol) to be dissolved in 75gm of benzene to lower it's freezing point by 0.48k(kf=5.12 Kkg /mol).

Posted by Kamlesh Kumar 6 years, 5 months ago

CBSE > Class 12 > Chemistry

4 answers

? Natasha Yadav? 6 years, 5 months ago

Most welcome

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Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

thx ?

1Thank You

? Natasha Yadav? 6 years, 5 months ago

Good answer.

1Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 5 months ago

➡️Tf =0.48k ➡️Kf =5.12 k kg / mol ➡️WA =75g ➡️MB= 256 g/ mol ➡️WB =? ➡️ Tf = Kf ×WB×1000/MB×WA ➡️ WB = Tf×MB×WA/Kf ×WB×1000 ➡️ WB = 0.48×256×75/5.12×1000 ➡️ WB = 18 g

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ANSWER

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