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What is optically active compound

Posted by Vaibhav Saini 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Keshav Kumar 5 years, 11 months ago

plan polarised light gets rotated (either left or right) through certain compunds those compounds are called optically active compounds.......its identification is that its asymmetric, non-superimposable and chiral

ANSWER

The rate of disappearance of H2 in Haber Process is 2 into 10 power minus one more per litre per second find the rate of disappearance of NH2 second rate of appearance NH3 third rate of reaction

Posted by Jai Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

The electrical resistance of a column of 0.05M NaOH solution of diameter 1cm and length 50cm is 5.55×10^3 ohm.Calculate the resistivity to, conductivity & molar conductivity

Posted by Amol Gùpta 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yuvraj Singh 5 years, 11 months ago

Resistivity (R) = 3.48 Ohm×meter Conductivity(K) = (1/R) = 1/3.48 = 0.287 ohm^-1 × meter^-1 Molar conductivity = K×1000/Concentration = 5.74 × 10^3 S × meter^2 × mol^-1

ANSWER

The conductivity of 0.001M acetic acid is 4 ×10^-5 S/cm . calculate the dissociating constant of acetic acid.if molar conductivity at infinite dilution for acetic acid is 390 S cm^2 m/mol

Posted by Amol Gùpta 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Yuvraj Singh 5 years, 11 months ago

λ= k × 1000/C = 40 λ°=390 α= λ/λ°=0.1025 Ka = Cα^2/1-α= 1.18 × 10^-5

Yuvraj Singh 5 years, 11 months ago

1.18 × 10^-5

ANSWER

Can we use acidic KMnO4 instead of basic KMnO4 while converting ethyl benzene to benzoic acid ?

Posted by Paras Thakur 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Its All About 5 years, 11 months ago

Just by adding the presence of dil HCl in KMnO4

ANSWER

What is lanrhanoid contraction

Posted by Vishnu Patel 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 11 months ago

Lanthanoid contraction:

As we move along the lanthanoid series, the atomic number gradually increases by one or we can say number of electrons and protons increases by one.
Addition of electrons to the same shell increases the effective nuclear charge.
Increase in atomic number also increases the number of electrons in the 4f orbital having poor shielding effect due to which the effective nuclear charge upon the outer electrons also increases.
Therefore the size of lanthanoids steadily decreases with the increase in the atomic number and phenomenon is called lanthanoid
As a result of lanthanoid contraction there is a similarity in the properties of second and third transition series.

Vishnu Patel 5 years, 11 months ago

Lanthonoid

ANSWER

Hey ...how to prepare chemistry for exams....I am a bit tensed.

Posted by Priya Sharma 5 years, 11 months ago

CBSE > Class 12 > Chemistry

4 answers

Parul Singh 5 years, 11 months ago

Do revision questions from exampler

Aman Tiwari 5 years, 11 months ago

Do written practice of reactions and theory

Mannat Kaur Khalsa? 5 years, 11 months ago

Then...10 years question papers...

Mannat Kaur Khalsa? 5 years, 11 months ago

Do..ncert properly....

ANSWER

Study of the presence of oxalate ions in guava fruit at different stages of ripening

Posted by Bala Ji 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the reaction and observations when KMnO4 reacts in acidic, basic and neutral medium?

Posted by Guddu Yadav 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

The most commonly used battery in modern electric cars..

Posted by Nitin Lakhlan 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 11 months ago

Lithium-ion batteries are currently used in most portable consumer electronics such as cell phones and laptops because of their high energy per unit mass relative to other electrical energy storage systems.

ANSWER

What is structure of hexaamimecobalt(3)sulphatr

Posted by Manisha Manisha 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Its All About 5 years, 11 months ago

[Co(NH3)6]+ SO4

Yuvraj Singh 5 years, 11 months ago

[Co(NH3)6]SO4

ANSWER

Is copper a transition element Its d orbital is completely filled

Posted by Badal Chaudhary 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Vishnu Patel 5 years, 11 months ago

Completely filled in oxidation state so; cu is a transition elment

ANSWER

How will you prepare Chloretone from acetone Ethylamine from methylalcohol

Posted by Prity Cks 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

calculate number of photons emitted by tube light 200 watt having efficiency 98% in 10 minutes in Lambda of photon 310 A°

Posted by Apeksha Patil 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is nickel cadmium

Posted by Manorama Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Saloni Saloni 5 years, 11 months ago

Nickel and cadmium is both elemnt

ANSWER

Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressureis 0.75 atm at 27⁰C.

Posted by Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

CBSE > Class 12 > Chemistry

27 answers

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

hnn bhai correct hai

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

sry bura lga toh

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

? ? Darshana fb comments hum bhi padhte hai... ? ?

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

thanks *

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

thinks ishika.

Amol Gùpta 5 years, 11 months ago

Best of luck ???? for tomorrow

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

abay pgl hai kya... kahin bhi kuch bhi bol ra hai jagaha toh dekh le ???

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

hnn aaj kl dosto ke liye kaha online rahegi. ? ? ? sub pta hai mujhe.. doreamon ki half plate. ? ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

aesa hai Tera jee kl hai... mera bhi neet aane wala hai. ? ? tere liye online thodi na rahoungi. ? ?

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

jaati*

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

tu offline ho gyi kya ? ? ?... kamal hai aandhi ki tarha aati hai toofaan ki taraha chli janti hai ???

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

thanks for ur motivation yrr ?? I will keep these points in my mind... hnn abb kuch nhi pdh raha mai ...pure saal kr liya Maine jitna krna tha... abb bus exam DE kr aa jaounga jo hoga samne aayega he.. Once again shukriya ???

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

abb zyda mt pdhyio... mind ko relax karo. abb bus... Jo pure saal kiya hai vo samne aana he hai . nd itna toh hai pure saal tumne tym waste nhi kiya... so ,be +ve, do ur best. ???

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

aur dhakan... Best of luck for ur jee. ✌️ Josh mein hosh mt khona.. advice for physics .... question dekh kr ghabrana mt advice for chemistry... nd question dekh kr over excited mat hona advice for maths. ???... acche se dena.... chill ho kr jayio. Best of luck. ?

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

thats sis

Amol Gùpta 5 years, 11 months ago

And hn congrats brother

Amol Gùpta 5 years, 11 months ago

I knw tumko answer mil gya phir bhi?? it's 3.42

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

tu offline ho gyi kya ?????

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

PREBOARD kesa tha

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

dono baatein correct hai. ? ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

yahi bolega abb tu. ? ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

thanks vo kya hai na exam se 1 week pehle Darshana naam ki chori se lagai hui thi baat dil pr le gya... aur exam crack kr ke dikha diya. ? ? ? ? ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

beta aesa hai first attempt mein crack krna hai neet.. tujhe .... ye mind set kr lo.

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

hey BTW congratulations ? NDA crack kr diya chore ne. ? ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

? ? ? ye kya puch liya. ye kya hota hai .. ? ? ? ... neet ka naam pr majak ho raha hai meri zindgi mein... roz uth kr sochti hoon aaj 11th karungi but aadat se majbor... 12th he revise kr ri hoon. ??? 11th ka content toh gol ho gya Pura ??

Řøhăň Řąjpůť ✌️✊ 5 years, 11 months ago

arrey bio wali shukriya ??.. tumhari bio mein hota hai na extinct species... vo hoti jaa rahi ho tum... dikhti he nhi... BTW neet ki preparation kesi chl ri hai tumhari ?

Ďãřşháñăã Yadav ? ? ? 5 years, 11 months ago

aur sports quota. ? ? ? preparing for JEE aur aesa question. ??? BTW here is your answer π= ixWB xRxT / MB x V ? Molar mass of CaCl ,M =40+2 X 35.5 = 111 g mol–1 ➡️ Therefore, Molar mass ofCaCl2 , WB = 0.75atmx111gmol^-1 x2.5L/ 2.47x0.0821x300K = 3.42g

ANSWER

MINIMUM QUANTITY OF MANGNASE DIOXIDE REQUIRED FOR PREPARATION OF OXYGEN FULL DETAIL PLEASE SIR THAT WILL BE GREAT HELP FOR ME

Posted by Jayraj Baria 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Maximum covalency of oxygen

Posted by Priya Sharma 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Its All About 5 years, 11 months ago

+2

Pranjali Pandey 5 years, 11 months ago

Maximum covalency of oxygen is 3.

ANSWER

Resonating structure of chlorine plezz answer

Posted by Aman Rajput 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Compare the reactivity of acetone and ethanal towards nucleophilic addition reactions.

Posted by Sejal Uniyal 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Its All About 5 years, 11 months ago

*in acetone ch3coch3 there are 2 methyl groups present that adds +I effect and increases e- density on carbonyl carbon .futher that carbon is sterically hindered to attack of nucleuphiles so nucleophilic addition are difficult. *In case of ethanal ch3cho there is no such hinderance or noticable +I effect thus nucleophilic addition are done.

Keerthu Raghu 5 years, 11 months ago

Due to steric and electronic reasons aldehydes are more reactive than ketones towards nucleophilic substitution reaction. Thus ethanal is more reactive than acetone

ANSWER

important question of chemistry

Posted by Saveen Kumar 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Sakshi G 5 years, 11 months ago

Abcd

ANSWER

example of micellers system?

Posted by Yash Pratihasta 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Its All About 5 years, 11 months ago

Detergent ke ghag wali balti?

Yogita Ingle 5 years, 11 months ago

Micelle formation is done by substance such as soaps and detergent when dissolved in water. The molecules of such substance contain a hydrophobic and hydrophillic part. When present in water these substance arrange themseleves in spherical structure in such a manner that their hydrophobic parts are present towards the centre, while hydrophilic parts are pointing towards outside. This is known as micelle formation.

A particle of colloidal size formed due to aggregation of several units of soap (surfactant) molecules in a dispersion medium is called micelle. A micelle usually consists of 50 to 100 molecules of the surfactants.

Examples of Miceller system: (i) Sodium stearate + water

ANSWER

List important sources of sulphur

Posted by Madan Arora 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Its All About 5 years, 11 months ago

Volcanic soil.crude oil.gypsum.

Yogita Ingle 5 years, 11 months ago

Sulphur mainly exists in combined form in the earth's crust primarily as sulphates [gypsum (CaSO₄.2H₂O), Epsom salt (MgSO₄.7H₂O), baryte (BaSO₄)] and sulphides [(galena (PbS), zinc blends (ZnS), copper pyrites (CuFeS₂)].

ANSWER

What is shape selective catalysis

Posted by Suraj Chaudhary 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 11 months ago

A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shape-selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction.

ANSWER

What happens, when aldols readily lose watee

Posted by Shruti Kumari 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Keerthu Raghu 5 years, 11 months ago

Only on heating they lose water molecule to form aldol condensation product

ANSWER

Important convrsions of aldehyde, ketones and carboxylic acid

Posted by Amit Jangra 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Its All About 5 years, 11 months ago

Reactions including acyl halides.cross aldol .and oxidation

ANSWER

Electrophilic and nucleophilic reagent

Posted by Shilpi Gupta 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 11 months ago

Nucleophiles: A nucleophile is a species (anion or a molecule) which is strongly attracted to a region of positive charge.
Nucleophiles are either fully negative ions or have a strong –ve charge. Common nucleophiles are hydroxide ions, cyanide ions, water and ammonia.
Notice that each of these contains at least one lone pair of electrons either on an atom carrying a full negative charge or on a very electronegative atom carrying a substantial-charge.
Electrophile: A electrophile is a species (cation) which is electron deficient hence attacked by negatively charged or electron rich species.
It participated in a chemical reaction by accepting an electron pair from nucleophile.
common electrophiles are Cl⁺, NO₂⁺, HSO₃⁺ etc.

ANSWER

Please tell the experiment of 1cation and 1anion briefly

Posted by Ujjawal Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which chapter or topics remove from cbse syllabus??

Posted by Âññü Šîñg*H??? 5 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Âññü Šîñg*H??? 5 years, 11 months ago

Thanks for your answer?

Sohan .G 5 years, 11 months ago

Chemistry • Chapter 1 (Solid state) has been deleted • ‘Group-15’ deleted from p-block elements • Classification: natural and synthetic, methods of polymerization (addition and condensation) is deleted from Polymers • Design of Question Paper changed (20 Marks Objective Questions have been added and the total number of questions has increased to 37 from 27) Chemistry (Lab Manual) • No change in practicals

Prachi Sahu 5 years, 11 months ago

Solid states and group 15 of p block

ANSWER

Chemistry me best score kaise karen Approx 60 to 65 out of 70

Posted by Digvijay Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Ďãřşháñăã Yadav ? ? ? ✊ 5 years, 11 months ago

I think ncert is enough for chemistry . if you want to score 65+ out of 70 in chemistry clear ur concept... solve ncert intact, text questions, do ten year question. solve cbse sample paper that's it..

ANSWER

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