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

As per from my prospective water is solvent, in this case, reason- 1. Considered as universal solvent.....2. Molecular mass of ethanol is larger than water, so it's no. Of moles is less. and if moles is less than state of solute acquire and water as solvent.

3Thank You

Vaishnavi Kalvakuntla 5 years, 10 months ago

Ethanol solute and water solvent because water is less viscous

1Thank You

Arnav Kandari 5 years, 10 months ago

How??

1Thank You

Gaurav Rawat 5 years, 10 months ago

Water is solvent

3Thank You

ANSWER

What is the effect on adsorption by increasing or decreasing the pressure??

Posted by Arnav Kandari 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Tamanna Sharma 5 years, 10 months ago

P ?ing then adsorption also ?ing or vice versa but upto a limit because at very high pressure ( adsorption is constant),,freundlich is unable to explain the extent of adsorption at high pressure,then Langmuir explain it with his model with the consideration of surface area of adsorbent.

2Thank You

Riya Rana 5 years, 10 months ago

With increasing in pressure adsorption increases and with decrease it decreases..

1Thank You

Shalini Singh 5 years, 10 months ago

It also decreases

1Thank You

ANSWER

conversion of propanol to propene

Posted by Gaurav Wrhfuir 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Deeya Singh 5 years, 10 months ago

Propanol (in presence of conc. H2SO4) ----> Propene

1Thank You

Harshvardhan Gupta 5 years, 10 months ago

Propanol + SOCl2 ------->CH3-CH2-CH2Cl Then, CH3-CH2-CH2Cl + alc KOH -->Propene

0Thank You

Tapan Pandey ?? 5 years, 10 months ago

Means dehydration kr do propanol ka

1Thank You

Tapan Pandey ?? 5 years, 10 months ago

Bani apne ko toh bs pani nikalna h

1Thank You

ANSWER

propanol to propene

Posted by Gaurav Wrhfuir 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Riya Rana 5 years, 10 months ago

First add socl2 then alc koh (dehydrohalogenation)

0Thank You

Vaishnavi Kalvakuntla 5 years, 10 months ago

Propanation, acidification,dehydration

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ANSWER

Log use in E cell

Posted by Gungan Devi 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Arnav Kandari 5 years, 10 months ago

Question hai ki Answer ????

0Thank You

Vinay Gautam 5 years, 10 months ago

Most importanat h

0Thank You

Riya Rana 5 years, 10 months ago

Ecell = E° cell - 0.0591/n × log (O/R) here... We solve O/R and put the value of log to find out our answer..

0Thank You

ANSWER

Oxidation of alcohol to acid.....in the presence of kmno4 and cro3...when to use kmno4 and when to use cro3??????....it's confusing in conversions ..piz ...answer. ....piz.....i am confused.........

Posted by ▪▪Amrit▪▪ ❤ 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Muskaan Vig 5 years, 10 months ago

you can use CrO3+H2SO4(Jones reagent) or KMnO4 to convert alcohol ???????? to acid ....but ???? CrO3..will convert alcohol to aldehyde which requires further oxidation....to acid..

0Thank You

ANSWER

If we want concentration greater than 10%of ozone then how we estimate it easily??

Posted by Harshil Parashar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Nikita Beniwal 5 years, 10 months ago

Estimate by reaction with Kl then by titration

0Thank You

Manjay Jha 5 years, 10 months ago

Anytime!

2Thank You

Harshil Parashar 5 years, 10 months ago

Thanxx

0Thank You

Manjay Jha 5 years, 10 months ago

By storing it in silica gel as it functions as an Adsorbent.

2Thank You

ANSWER

Generally iupac naming also comes in organic chemistry or not?

Posted by Gaurav Rawat 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Vineet Soni 5 years, 10 months ago

Yaa

0Thank You

Manjay Jha 5 years, 10 months ago

Yes. It can.

1Thank You

ANSWER

Sulphur shows greater catination than oxygen.How?

Posted by Harshil Parashar 5 years, 10 months ago

CBSE > Class 12 > Chemistry

10 answers

Arjun Kumar Yadav 5 years, 10 months ago

Because sulphur is polyatomic or oxygen is diatomic

1Thank You

Harshil Parashar 5 years, 10 months ago

Yupp! Vaishnavi thank u ?

1Thank You

Avantika Tayal 5 years, 10 months ago

Hey shreya i got what u said.actually i typed a little wrong.the o-o bond at room temp is weeker than sulphur.plzz do correct this in your mind. Secondly u mentioned lone pair ...basically this bond is weeker just because of lone pair on oxygen which causes repulsions and makes its bond dissociation enthalpy less than that of sulphur...and hence does not show catenation... Hope this clears your doubt...

1Thank You

Harshil Parashar 5 years, 10 months ago

Thank u so much .Ur reply releaved me. About my text? thanks again shruti?

2Thank You

Manjay Jha 5 years, 10 months ago

Ooops! Sorry, Shreya i didn't saw your text. Btw what you said about oxygen is absolutely correct but in some cases we go for more appropriate answers !

2Thank You

Harshil Parashar 5 years, 10 months ago

I am asking is what i have texted abt lone pair is correct or not. I am not asking abt.sulphur i am asking abt oxygen..hope u understand

1Thank You

Manjay Jha 5 years, 10 months ago

Sulphur shows greater catination cuz' it has vacant d orbit and bond between S-S at room temperature is much weaker leads to formation of catination.

2Thank You

Harshil Parashar 5 years, 10 months ago

What u said i got ur point. But isn't it about lone pair presence on oxygen due to which repulsion occurs.If not then why ..pplz help me out this

1Thank You

Avantika Tayal 5 years, 10 months ago

Oxygen due to its small size,highest electronegativity and absence of vacant d orbital do not form catenated chain of oxocompounds.but sulphur has vacant d orbital.moreover s-s bond at room tp is weeker so exist as catnated compounds.

2Thank You

Killer Xmarty 5 years, 10 months ago

Because of increasing bond enthalpy???

1Thank You

ANSWER

Cl2 + f2(excess) - ?

Posted by Kirti Kasaudhan 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 10 months ago

ClF3 is formed

1Thank You

ANSWER

Haloalkins and halo areans in the full chapter note

Posted by liya****@***** 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaihem Kamei 5 years, 10 months ago

See chemistry chapter 10..revise the textbook?

0Thank You

ANSWER

Halohalkins and halo areans

Posted by liya****@***** 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

M kitna score kar sakti hu agar m sirf previous 10 years questions kar lu (without doing extra ncert questions ) In CHEMISTRY for 2020 PLEASE TELL ME

Posted by Chhavi Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Tamanna Sharma 5 years, 10 months ago

Kinetics se o and 1st order rxn., solution se raoult's law and Henry's law, azeotropes and many more given in NCERT

0Thank You

Rudra Gupta 5 years, 10 months ago

Graph kis cheej ka

0Thank You

Tamanna Sharma 5 years, 10 months ago

40+ agar NCERT graph aur add kar lo to

0Thank You

ANSWER

Kon kon sa subject ho gya sabka....

Posted by Shalini Singh 5 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Vivek Thakur 5 years, 10 months ago

How would you clear physics

0Thank You

Mayank Zode 5 years, 10 months ago

Abe lodu

0Thank You

Tamanna Sharma 5 years, 10 months ago

Maths complete, physics almost ,chemistry( p,d,f block left)

4Thank You

Anuj Maurya 5 years, 10 months ago

Sab ho gaya???

0Thank You

ANSWER

IUPAC nomenclature

Posted by Mahima Gupta 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Tamanna Sharma 5 years, 10 months ago

Hope this suggestion will help you

0Thank You

Tamanna Sharma 5 years, 10 months ago

What you want to ask because in 12th its only important for amines , coordination and some easy naming for ethers, so for organic please focused on name reaction conversion and reasoning a

0Thank You

ANSWER

Examples and solutions of iupac nomenclature

Posted by Mahima Gupta 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 10 months ago

Important only given in NCERT

0Thank You

ANSWER

PCl4+ and PCl4- ,,which one is not exists and why .

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Give reason: both O2 and F2 stablize high oxidation states but the ability of O to stabilize the higher oxidation state exceeds that of F.

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Riya Rana 5 years, 10 months ago

Oxygen forms multiple bonds.

2Thank You

Gaurav Seth 5 years, 10 months ago

O₂ and F₂ both stabilise high oxidation states with metal but the tendency is greater in oxygen than fluorine. It is because O₂ bears -2 charges for each oxygen atom while F₂ bears only -1 for each atom thus the force of attraction between the metal atom and O^2-ion is greater than the force between the same metal atom and F^- ion. Thus, oxygen has the ability to form multiple bonds with transition element whereas fluorine does not have the ability to form multiple bonds with transition elements. Hence, O₂ gets the higher state of metals.

3Thank You

ANSWER

I^+ (aq) + H2O (l) + O3 (g) ~ ????

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 5 years, 10 months ago

I2 + H+ + O2 {this is quantitative analysis of ozone}

1Thank You

ANSWER

P4 (s) + NaOH (aq) + H2O (l) ~ ?..

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 5 years, 10 months ago

I think this is a reaction from group 15 and it aint in our syllabus anymore..

1Thank You

ANSWER

Give reason ,H3PO2 behaves as monoprotic acid.

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Muskaan Vig 5 years, 10 months ago

This group is not in our syllabus frnd...

2Thank You

Rajat Barwar 5 years, 10 months ago

Because the H attached with O only contribute to acidity....in this only one H is attached with O and one with P...Hope this may help u....

3Thank You

ANSWER

Why PbO2 is stronger oxidizing agent than SnO2?

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Rajat Barwar 5 years, 10 months ago

Because the inert pair effect increases down the group....hope this may help u...

2Thank You

ANSWER

Why H3PO2 acts as monobasic acid?

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 5 years, 10 months ago

Presence of one -OH group

2Thank You

ANSWER

What is the structural difference between orthosilicates and pyrosilicates?

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 6 months ago

No tetrahedral Oxygens shared with other tetrahedra
Based on SiO₄ ^4-
Also called nesosilicates
A diverse group of minerals, examples covered or touched on here or in lab:
- olivine
- garnet
- aluminosilicates
  - kyanite
  - andalusite
  - sillimanite
- topaz
- staurolite
- zircon
- titanite or sphene
- chloritoid
- humite group
structures determined by size(s) and charge(s) of cations in the structure
often rather dense minerals, high S.G., hard (lots of references to the Gems course), high R.I. - mantle phases
equant grains with generally poor cleavage
low amounts of Al substitution for Si
Pyrosilicates are silicates which contain Si₂O₇^6-. They are formed by joining two tetrahedral Si₂O₄^4-. When two Si₂O₄^4- are joined, there is removal of one oxygen atom and the two units join at the corner oxygen atom. Example is thortveitite, Sc₂Si₂O₇. The structure of pyrosilicate is:

The reds are oxygen atoms and greens are silicon.

Cyclic silicates contains (SiO₃)_n^2n- which are formed by linking three or more tetrahedral SiO₄^4- units cyclically. Each SiO₄^4- shares two oxygen atoms with other unit. Example is Benitoite, BaTi(SiO₃)₃. Here three SiO₄^4-units are arranged cyclically.

Orthosilicates: In simple Orthosilicates the SiO₄ ^4- tetrahedron units do not share any of its oxygen atoms with any of the other tetrahedra units. E.g. Willmenite ZnSiO₄, Zircon ZrSiO₄.

 Pyrosilicates or Island silicates

In Pyrosilicates one oxygen atom is shared by two silicate units General formula is (Si₂O₇)^6-

E.g. Thortevitite Sc₂[Si₂O₇] and Hemimorphite Zn(OH)₂(Si₂O₇)H₂O