CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Simple formula that is used to derive molecular formula, it is calculated by the ratio of the no. Of moles of elements. Ratio of molar mass and empirical formula mass gives n, then multiply n and empirical formula, which gives molecular formula.

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S.chand for chemistry is good i know praddep is best but i want to know

Posted by Ahil Gj 7 years, 5 months ago

CBSE > Class 11 > Chemistry

4 answers

Parikshit Singh 7 years, 5 months ago

I think pradeep is good

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Ishrat Khan 7 years, 5 months ago

ABC is easy to understand

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Shivangi Vats 7 years, 5 months ago

Because in pradeep there are many que.

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Shivangi Vats 7 years, 5 months ago

I think pradeep is better for chemistry

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How does the existence of line spectra support for Bohr model of the atom?

Posted by Varun Sharma 7 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Alisha Bhagat 7 years, 5 months ago

Till Rutherford the spectra formed by atoms couldn't be explained. Bohr's model of hydrogen atom could explain the reason behind formation of spectra of single electron atom like hydrogen and hydrogen like particles but its one limitation was that it couldn't explain spectra of mutielectron atom.

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What is mole?

Posted by Robin Hood 7 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Nancy Rajput 7 years, 5 months ago

Mole: One mole of a substance (atoms, molecules, ions, or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams. One mole of any substance contains 6.022 * 1023 particles (atoms, molecules, or ions), which is termed as avogadro number or avogadro constant.

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Explain bohr's model of an atom . (Postulates,limitations)

Posted by Harleen Kaur 7 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Tanishka Gaur 7 years, 5 months ago

Limitations - he is enable to explain the zeeman effect and stark effect .no conclusion was given for the quantisation of angular momentum

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Mr. Thakur 7 years, 5 months ago

You can find answer of this question in this app in revision notes of chapter2 of chemistry.

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how many gram of NaOH should be dissolved to make 100 cm^3 of 0.15M NaOH solution

Posted by Ritesh Sharma 7 years, 5 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Who has an idea of organic chemistry some basic principles and techniques its in chemistry part 2 text book

Posted by Deepika Tiwari 7 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Deepika Tiwari 7 years, 5 months ago

I am saying about chemistry bro

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Charu Vatsal 7 years, 5 months ago

What?

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If 0.5mole of BaCl2 is mixed with 0.2mole of Na3(po4)2 the maximum no.of mole of Ba3(po4)2 formed are

Posted by Uday Bari 7 years, 6 months ago

CBSE > Class 11 > Chemistry

6 answers

Aman Kumar 7 years, 5 months ago

But eska fayeda bhi hai..?

1Thank You

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 5 months ago

if they will provide camera.. then instead of posting answer people will post their pics. ?

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Aman Kumar 7 years, 5 months ago

Khas, this app had the camera system....

1Thank You

Aman Kumar 7 years, 5 months ago

Hota hai, mere sath bhi hua tha ek bar

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∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 5 months ago

mehnet bekar ho gyi... but.. hope you will understand. ?

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∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 5 months ago

3BaCl2 + 2Na3PO4 -------------> Ba3(PO4)2 + 6Nacl 0.5 mol 0.20 mol x mol ⏩ ⏩ limiting reagent 0.5/3 = 1/6 0.2/2 = 1/10 1/10 < 1/6 thus, Na3PO4 is the limiting reagent. Now, 1/10 = x/1 x = 0.1 mol.

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A 2.5L flask contains 0.25 mol each of sulphur dioxide and nitrogen gas at 27degree C. Calculate the partial pressure of each gas and also total pressure.

Posted by Maithili Sakholkar 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

what is aufbau ?

Posted by Themitesh Makwana 5 years, 9 months ago

CBSE > Class 11 > Chemistry

3 answers

Aman Kumar 7 years, 6 months ago

Aufbau principle is the submission of 2 rules:- 1) Lowest sum rule:- That orbital will filled first for which the value of n will be minimum. E.g. 3d= n+l=3+2=5 4s=n+l= 4+0=4 2)If the value of (n+l)willbe same then that orbital will filled first which value of n will be minimum.. E.g. 3p=n+l=3+1=4 4s= n+l=4+0=4

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Nancy Rajput 7 years, 6 months ago

Aufbau principle states that : In the ground state of the atoms, the orbital are filled in increasing order of their energies. i.e electrons first occupy the lowest energy orbital available to them and enter in the higher energy orbital only after the lower energy orbitals are filled. The order in which the electrons are filled is : 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p.. and so on

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∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levelsbefore occupying higher levels.

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Explain crystallization

Posted by Mr. Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

Crystallization is a technique used for the purification of substances. A separation technique to separate solids from a solution.

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Explain hand picking

Posted by Mr. Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

it is of 6th class yarr anyway.. your answer is : The process used to separate slightly large particle from a mixture by hand is called handpicking...

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What is the kathode ray

Posted by Umae Alvi 7 years, 6 months ago

CBSE > Class 11 > Chemistry

4 answers

Srashti Katre 7 years, 5 months ago

Stream of negatively charged particle

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Nikhil Goyal 7 years, 6 months ago

Cathode rays is negatively charged.

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Aman Kumar 7 years, 6 months ago

And second, in simple word cathode rays are the negatively charged particle

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Aman Kumar 7 years, 6 months ago

First of all it is cathode rays

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Explain term composition.

Posted by Mr. Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

composition can be defined as the arrangement, ratio, and type of atoms in molecules of chemical substances.

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2.66 gram of a metal when treated with AgNO3 gave 2.87 gram of AgCl . 3.37 gram of another chloride of the same metal gave 5.74 gram of AgCl when treated with AgNO3 solution . Show that the results illustrates law of multiple proportions .

Posted by Suyash Tripathi 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

An oxide AxOy has molecular weight 288u. Atomic weight of A and O respectively are 12 and 16 . What is the formula of compound , if A is 50% by weight.

Posted by Jatin Saini 4 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Dhanuja Kumar 4 years, 5 months ago

osj

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What is the latent heat of fusion

Posted by Aditya Raghav 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

latent heat of fussion is defined as the amount of heat energy required to change 1kg of solid into liquid at atmospheric pressure without any change in temp. at it's melting point..

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What are the frequency &wavelength of the proton emitted during the transaction from 5th energy shell to 2nd energy shell

Posted by Shalu Y 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Which is best book for chemistry

Posted by Priya Yadav 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Mr. Thakur 7 years, 6 months ago

For learning and reading N.C.E.R.T Textbook ; N.C.E.R.T Examplar and For Practice Pradeep chemistry

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∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 6 months ago

Ncert and pradeep.. are best

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A lady went to a market to buy a blanket the shopkeeper sold her blankets made of acrylic fibre as well as made of wool sheep referred to by an acrylic blanket can you guess why

Posted by Aayushi Rawat 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

For chemistry which reference book is good ...pl.reply fast

Posted by M Afisha 7 years, 6 months ago

CBSE > Class 11 > Chemistry

7 answers

Harsh Singh 7 years, 6 months ago

Nutan physics book is very best for self study, this book language is very simple.

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Renu Yadav 7 years, 6 months ago

Modern abc of chemistry is the best because it has different types of questions and it is helpful for competitive exam also

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Tapan Pandey 7 years, 6 months ago

Modern abc for chemistry and rd Sharma for mathematics

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M Afisha 7 years, 6 months ago

Also fr maths

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M Afisha 7 years, 6 months ago

I mean guide..

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Anmol Yadav 7 years, 6 months ago

Modern publication

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Anmol Yadav 7 years, 6 months ago

NCERT

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Which is best theory book of chemistry for iit

Posted by Kumar Vivek 7 years, 6 months ago

CBSE > Class 11 > Chemistry

3 answers

Tapan Pandey 7 years, 6 months ago

Modern abc

1Thank You

Anmol Yadav 7 years, 6 months ago

KC Verma

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Anmol Yadav 7 years, 6 months ago

Arihant

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Calcium carbonate react with aqueous HCL to give calcium chloride and carbon dioxide according to the reaction CaCo3 + 2 HCL = calcium chloride + carbon dioxide + H2O what mass of calcium carbonate is required to react completely with 25 ml of 0.75 M HCL

Posted by Abhishek Verma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Explain planck's quantum theory and photoelectric effect.

Posted by Yash Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Find the numbers of photons emitted per second by a bulb of ? watt, emitting light of wave 400 Nano metres (nm)

Posted by Satyam Shukla 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Maitry Rajpoot 7 years, 5 months ago

Wavelenght = 400×10^-9m C= 3×10^8 Energy = hc/lemda 6.6×10^-34 × 3×10^8 / 400×10^-9 =49.695×10^-19 No of protons emitted = 100/49.695×10^-19 = 2.012×10^20s

1Thank You

Aditya Sinha 7 years, 6 months ago

Formula of no. of photons emiited:- Energy=hc/lamda.And energy=power×time.This way you can easily find out to no. of photon emitted.

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koi online hai

Posted by Tejus Di 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Yash Thakur 7 years, 6 months ago

Yaah!

4Thank You

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How we come to know that path in which electron revolve is circular...???

Posted by Anmol Yadav 7 years, 6 months ago

CBSE > Class 11 > Chemistry

6 answers

Anmol Yadav 7 years, 5 months ago

Lkin ye baat prove ho chuki h k electon circular nhi elliptical path pr rotate krte h....my question is...how we get to know k electron circular path m rotate krte h

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Tapan Pandey 7 years, 6 months ago

Centrifugal force and nuclear force both were acting on electron from opposite side so, the resultant force balance therefore, the electrons revolve in circular path

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Anmol Yadav 7 years, 6 months ago

Satisfactory answer nhi mila mujhe whan bhi

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Aman Kumar 7 years, 6 months ago

Then u can search in google...there u can get a variety of reasons..

1Thank You

Anmol Yadav 7 years, 6 months ago

Mujhe smj nhi aaya

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Aman Kumar 7 years, 6 months ago

I m not totally sure but I think that the distance b/w electron and nucleus when electron is revolving is same which shows that it is circular...