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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

Why oxygen is more electronagtive than sulpher

Posted by Rahul Singh 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Mishti ???? 5 years, 3 months ago

From where r u rahul singh dear...

Tanya ?? 5 years, 3 months ago

oxygen, the bonding electrons are at the 2-level, and the 8 protons in the nucleus are shielded by the 2 electrons in the 1s orbital. ... However, the bonding electrons in the sulphur are further from the nucleus, and so the attraction is lessened. So sulphur is less electronegative than oxygen

ANSWER

Structure of 3 methyl butanol

Posted by Yogesh Saini 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Vidip . 5 years, 3 months ago

CH3-CH2-CH^CH3-CH3-OH

ANSWER

Which is best arihant last 10years or cbse 10years champion?

Posted by Shubhanshu Tiwari 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Gaurav Bargujar 5 years, 3 months ago

Arihant

Suraj Singh 5 years, 3 months ago

Arihant is best

ANSWER

Hlo TANYA if u want to last 10 years paper i think one app is very best for u.... Download the app "12 CBSE"

Posted by Vivek Chaurasia 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Iqbal Singh 5 years, 3 months ago

This is good app

Iqbal Singh 5 years, 3 months ago

Yes tanya

Tanya ?? 5 years, 3 months ago

Okay vivek ...thank u??

ANSWER

Bhaii koi organic chemistry ka idea bataoo.. Kuch smag nhii aa rha h?? Kon sa channel best h organic chem. K liye utube par..

Posted by Vivek Chaurasia 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Mishti ???? 5 years, 3 months ago

Use NCERT explanation & revise all the reaction , mechanism from NCERT it may surely help u ... Ya I m also using mritunjay pandya mean gravity circle he explain every concept very well Regards.??

Iqbal Singh 5 years, 3 months ago

I also

Tanya ?? 5 years, 3 months ago

Yes devil u r right m bhi arvind sir aur mritunjya sir ki video dekhti hu

Devil ? 5 years, 3 months ago

Gravity circle .. for ncert Arvind arora for compitition

ANSWER

A solid AB has rock salt structure,if the radius of cataion is 100pm find the minimum size of anion which is suitable for this cataion to occupy octahedral voids

Posted by Ambica Choudhury 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

what is the difference between dehydrogenation of alcohol and oxidation of alcohol????

Posted by Khushi Rawat 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Chirag Dhakad 5 years, 3 months ago

In dehydrogenation there is removal of H2 molecule from alcohol in presence of Cu ,forms ketone and in oxidation of alcohol there is two cases For primary alcohol :form aldehyde For secondary alcohol :form ketone

Anshuman Mishra 5 years, 3 months ago

Both are oxidative process difference of catalyst

ANSWER

A metal of atomic mass 50 has BCC structure. Density is 5096 g/cm3. calculate volume?

Posted by Diya Shibu 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Anshuman Mishra 5 years, 3 months ago

ρ=5096 g/cm3= density Z=2 atoms M=50 g/mol N0=6.023×10^23 atoms/mol=Avogadro's number a= edge length Density ρ=Z×M/N0×a3 5.96 g/cm3=(2atoms×50g/mol)/6.023×10^23atoms/mol×a^3 V=a3=3.26×10^-26 cm^3

ANSWER

Conversion of chlorobrnzene to 1-chloro-2-methylbenzene

Posted by Ashna Ashna 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Ritika Gautam 5 years, 3 months ago

Wurtz fittig reaction... By adding 2Na + Cl-CH3....

Bhawna Sangwan 5 years, 3 months ago

It is wurtz fittig reaction

ANSWER

Benzamide is heated in the presence of H,0 ?

Posted by Vinay Saxena 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Chirag Dhakad 5 years, 3 months ago

When benzamide is heated with dilute mineral acid we get benzoic acid and a salt ammonium chloride as products.

ANSWER

What is grooves process ? ORGANIC CHEMISTRY

Posted by Iqbal Singh 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Iqbal Singh 5 years, 3 months ago

Thanks both yogita and tanya sis

Yogita Ingle 5 years, 3 months ago

It is the process to synthesize alkylhalide from alcohol using ZnCl₂.

The reaction can be written as:
                               Anhyd ZnCl₂
R --- OH + H---X     ========>>   RX + H₂O

The reactivity order of  in the above reaction is : HI > HBr > HCl > HF

Reactivity order of alcohols = 3⁰ > 2⁰ > 1⁰ > MeOH

2⁰ and 3⁰ alcohols undergo SN₁ mechanism, whereas 1⁰ and MeOH undergo SN₂ mechanism. Concentrated HCl + anhy. ZnCl₂ is known as lucas reagent. In Groove's process, ZnCl₂ is used to weaken C-OH bond. In case of 3⁰ alcohol, ZnCl₂ is not required.

Example = Anhyd ZnCl₂
C₂H₅OH + HCl    ===========>> C₂H₅Cl + H₂O

Tanya ?? 5 years, 3 months ago

Process to synthesize aldehyde from alcohol using ZnCl2. 2°and 3° alcohols undergo sn1 mechanism ,whereas 1° and MeOH undergoes sn2

ANSWER

The size of the particle is enough to scatter light and exhibit tyndall effect

Posted by Iqbal Singh Singh 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Iqbal Singh 5 years, 3 months ago

Sorry I mean question

Iqbal Singh 5 years, 3 months ago

I can't understand your answer iqbal

ANSWER

Anyone can explain isotonic,hypotonic and hypertonic solutions with examples.?in own language because I didn't understand Google's language??

Posted by Mr. Badmash 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Sakshi Mehta 5 years, 3 months ago

Just go for "success catalyst" channel she explained very well

Devil ? 5 years, 3 months ago

Hypotonic less conc. Of solute ie more conc of solvent (h20).. ie water move from high conc. To low .. so cell would swell up ... And same viceversa statements for others

ANSWER

Name two alkenes that will yield 1-Chloro-1-methylcylohexane

Posted by Abhishek Kabir 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

I need last 10 paper with solution of chapter 2

Posted by Anushka Choudhary 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Madhu Uma 5 years, 3 months ago

Hi

Tanya ?? 5 years, 3 months ago

I think u get from Google or any other app...if there is any app please tell me also..

ANSWER

Why does fluorine has most electronegative element in periodic table

Posted by Sahil Dongre 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Shweta? Dhama? 5 years, 3 months ago

The electronic configuration of fluorine is 1s2 2s2 2p6...it has 5 electrons in its 2p shell..it will usually form anion F(negative )since it is extremely electronegative nd strong oxidising agents..it is the top element in halogen group and therefore is vry reactive....

ANSWER

Raoult' s law as special case of Henry' s law

Posted by Romy Moon 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Shweta? Dhama? 5 years, 3 months ago

According Raoults law...the partial pressure of each component is directly proportional to mole fraction of solutions... Raoults law is given by...p=p*x where p is partial pressure or X Is mole fraction and p*is vapour pressure of pure component ... Henry's law is given by...p=kH x Where p is partial pressure and X Is mole fraction kH is proportionality constant ... Hence Raoults law is special case of Henry's law kH=p*...and both R.L and H.L obeyed in opposite composition ranges....hope so it helps u...?

Iqbal Singh 5 years, 3 months ago

Can u please answer my questions please I join today no one help me please ???

Iqbal Singh 5 years, 3 months ago

Yes . This question is available in this app (important questions)

ANSWER

How to make a graph of concentration v/s time for product?

Posted by Santosh Pratap 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Iqbal Singh 5 years, 3 months ago

Concentration may not effected by time .

Iqbal Singh 5 years, 3 months ago

Chapter name please because this is also in chemical kinetics and solutions .

ANSWER

Basic of chemistry

Posted by Aditya Rana 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Iqbal Singh 5 years, 3 months ago

It is the branch of science which deals with the production of composition and properties of substances and various elementary forms of matter . MAY It helps u dear Aditya ??

ANSWER

Describe the effect of dilution on molar conductivity

Posted by Aarushi Vohra 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 3 months ago

Conductivity changes with the concentration of the electrolyte. The number of ions per unit volume carrying the current decreases on dilution, so conductivity always decreases with decrease in concentration. However, molar conductivity increases with dilution.

ANSWER

Tollen's test

Posted by Pranav Gupta 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Nikita Choudhary 5 years, 3 months ago

When aldehyde are treated with Tollen's reagent then they give the formation of carboxylate ion and silver mirror is formed whereas ketones do not give any such reaction. This test is used to distinguish between aldehydes and ketones. It is also known as "silver mirror test".

ANSWER

Dalton's law of partial pressure

Posted by Romy Moon 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Amit Panwar 5 years, 3 months ago

This law is states that the total pressure is equal to the partial pressure.

... Yang ... 5 years, 3 months ago

Dalton’s law of partial pressure is a gas law which states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture. For example, the total pressure exerted by a mixture of two gases A and B is equal to the sum of the individual partial pressures exerted by gas A and gas B. HoPe It HeLpS yOu??

Romy Moon 5 years, 3 months ago

Dalton law of partial pressure

ANSWER

Formation of oxime from carbonyl compound

Posted by K N P 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Available chemistry notes for 1st to 5 chapter

Posted by Ayush Kamboj 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Ayush Kamboj 5 years, 3 months ago

Mere no.p

... Yang ... 5 years, 3 months ago

Where to contact uh???

ANSWER

If you need chemistry notes so plz contact me

Posted by Ayush Kamboj 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Ayush Kamboj 5 years, 3 months ago

At 9P.M or 11a.m.

Ayush Kamboj 5 years, 3 months ago

Cntct m

Ayush Kamboj 5 years, 3 months ago

So cntct me

Itzz Aayu 5 years, 3 months ago

also me

... Yang ... 5 years, 3 months ago

Yes I Need

ANSWER

At 400°c the vapour pressure of water is 53.3 mm hg. Calculate the vapour pressure at same temperature over 10% aqueous solution of urea [co(nh2)2]

Posted by Ibarikmen Rynjah 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Aditya Shindhe 5 years, 3 months ago

53.48 mm Hg Solution : Mass of urea in 100 g of soution = 10 = 90 g Mass of water in the soltion=100−10=90gMass of water in the soltion=100-10=90g No. of moles of urea=(10g)(60g mol−1)=5.0molNo. of moles of urea=(10g)(60g mol-1)=5.0mol No. of moles of water(90g)(18g mol−1)=5.0molNo. of moles of water(90g)(18g mol-1)=5.0mol Mole fraction of water=(5.0mol)(5.0mol)+(0.17mol)=5.05.17=0.967Mole fraction of water=(5.0mol)(5.0mol)+(0.17mol)=5.05.17=0.967 Vapoure pressure of water over aquious solution =P∘water×Cwater=(55.3mm)×0.967Vapoure pressure of water over aquious solution =Pwater∘×Cwater=(55.3mm)×0.967 =53.48 mm Hg.

Rohiit Guptaa 5 years, 3 months ago

53.48 mm Hg Solution : Mass of urea in 100 g of soution = 10 = 90 g Mass of water in the soltion=100−10=90gMass of water in the soltion=100-10=90g No. of moles of urea=(10g)(60g mol−1)=5.0molNo. of moles of urea=(10g)(60g mol-1)=5.0mol No. of moles of water(90g)(18g mol−1)=5.0molNo. of moles of water(90g)(18g mol-1)=5.0mol Mole fraction of water=(5.0mol)(5.0mol)+(0.17mol)=5.05.17=0.967Mole fraction of water=(5.0mol)(5.0mol)+(0.17mol)=5.05.17=0.967 Vapoure pressure of water over aquious solution =P∘water×Cwater=(55.3mm)×0.967Vapoure pressure of water over aquious solution =Pwater∘×Cwater=(55.3mm)×0.967 =53.48 mm Hg.

ANSWER

Indian saltpetre is known also known as....?

Posted by Gautam Kumar Jha 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

... Yang ... 5 years, 3 months ago

Potassium Nitrate (KNO3). HoPe It HeLpS yOu??

Aditya Shindhe 5 years, 3 months ago

Potassium nitrate (KNO3) is also known as Indian saltpetre.

Yogita Ingle 5 years, 3 months ago

Potassium nitrate (KNO3) is also known as Indian saltpetre.

Yuvika Gupta 5 years, 3 months ago

Potassium nitrate

Tanya ?? 5 years, 3 months ago

Potassium nitrate

ANSWER

What is neuclophylic ?

Posted by Priyanshu Tripathi 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Devil ? 5 years, 3 months ago

That donates electrons .. nucleus lovinh

Aditya Shindhe 5 years, 3 months ago

A nucleophile is a reactant that provide a pair of electron to form a new covalent bond

Tanya ?? 5 years, 3 months ago

A nucleophile is a reactant that provide a pair of electron to form a new covalent bond

Suryakant Swain 5 years, 3 months ago

It is the study of neutron and proton at the centre of an atom.

ANSWER

Kisi k pass inorganic k note ha.. ?? Ya koi idea batao kasa smag aaya ga yrr reaction???

Posted by Vivek Chaurasia 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Tanya ?? 5 years, 3 months ago

See video of gravity circle..very helpful..he is just a awesome teacher

ANSWER

Any trick to do rattafication ?? in inorganic chemistry so plz help me because I'm very poor in learning ...??

Posted by Mishti ???? 5 years, 3 months ago

CBSE > Class 12 > Chemistry

5 answers

Devil ? 5 years, 3 months ago

??GUD GUD ? .. WORK HARD AND GAIN GUD MARKS IN MID TERM EXAM ???

Mishti ???? 5 years, 3 months ago

Abhi is inorganic ke bala se to nikle dear devil ??..... Mid - terms ke syllabus mai hai na so... Jab ye ho jayega to organic ko ratne mai kya jayega...? & I love ?? organic dear so I enjoy it don't do rattafication in it...??

Devil ? 5 years, 3 months ago

Organic m hoo gya ratta ???

Tanya ?? 5 years, 3 months ago

Same problem yrr?

Vivek Chaurasia 5 years, 3 months ago

Raatna tho padega.. ?? Ya fir concept smag jaoo? Because I'm also suffering from this bad situation ?????

ANSWER

Page 64 of 608

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App