Incorrect URL accessed!!!!

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Posted by Anshika Bhargava 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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Some important compounds of sodium, notes

Posted by Jokhyam Lamnio 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 4 months ago

The most important compounds of sodium that are of commercial importance are as follows-

Sodium Carbonate

It is commonly known as Washing Soda with molecular formula Na2CO3.10H2O.
It is synthesized by Solvay process. During this process, sodium carbonate is synthesized using sodium chloride and calcium carbonate. Sodium Chloride (NaCl)
The main source of sodium chloride is sea water.
Evaporation of sea water is the most common method to obtain sodium chloride.
Crude sodium chloride is obtained by crystallization of brine solution, containing sodium sulphate, calcium sulphate, calcium chloride and magnesium chloride
Sodium Hydroxide (NaOH)
Also known as Caustic Soda.
The process of formation of sodium hydroxide is known as Castner-Kellner Cell.

Sodium Hydrogen Carbonate

It is also known as Baking Soda with a molecular formula, NaHCO3.
Its decomposition forms carbon-dioxide.

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The wavelength of 1st line in balmer series is 656 nm. Calculate the wavelength of second line and the limiting line in balmer series

Posted by Ankit Aryan 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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find the position of Zn30 in periodic table

Posted by Dhruv Sharma 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Pk Prajapati 6 years, 4 months ago

Transition metals

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Which of the following species have the same shape? O3 and CO2 O3and NO−2 CCl4 and NO−2 NO−2 and CCl4

Posted by Geetika Chough 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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How to solve ion electron method

Posted by Gokul Naveen 6 years, 4 months ago

CBSE > Class 11 > Chemistry

2 answers

Shubhanjali Singh Gaur 6 years, 4 months ago

this is very easy method you can follow these steps clearly you can learn very easily and fastly . so lets start firstly you can separated the oxidation and reduction reactions . now you can add h2o and h+ if acidic medium otherwise you can add h20 and oh- if basic medium . now you can balanced the atoms next you can balance the ions . now you can add both the eq . of oxidation and reduction reaction . now it is completed . you try these steps clearly and you can try minimum 5 questions you can solve it easily .

Anjali Singh 6 years, 4 months ago

Very easy to solve

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Calculate the amount of water produced by the combustion of 16 g of methane

Posted by Paramjit Kumar 6 years, 4 months ago

CBSE > Class 11 > Chemistry

2 answers

Rachana Raut 6 years, 4 months ago

Wants more nice explanation

Mehak Gautam 6 years, 4 months ago

CH4 (g)+2O2 (g)————-> CO2 (g) +2H2O (g) Now, according to the reaction 1 mole of CH4 gives 2 moles of H2O And 16 grams of Methane mean 1 mole as its Molecular mass of methane is 16. so 1 mole of methane = 16/16 (given mass 16 and molecular mass 16) since 1 mole of methane is getting used up to form 2 moles of water. number of moles=given mass/molecular mass ——- eq. 1 molecular mass of water is 18. 2=x/18 ( where x is the mass of water produced , using equation 1) 2*18=36grams so 36 grams of water will be produced

3Thank You

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What is electronic configuration

Posted by Navdeepti Navdeepti 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Mehak Gautam 6 years, 4 months ago

The electron configuration of an element describes that how the electrons are distributed in their atomic orbitals.

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Some MCQ between chapter 1and2

Posted by Ashwani Sharma 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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Define reciprocal proportion

Posted by Aayan Hussain 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Drishti Arora 6 years, 4 months ago

It states that when two elements individually combine with a third element in some ratio to form two different compounds. Then the ratio in which they combine with each other will be a whole no. Multiple of the ratio of individual combination with 3rd element.

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Calculate the concentration of glucose labelled as 10% w/w in molarity and the mole fraction. If the density of the solution is 1.2 g/ml.

Posted by Kunal Sain 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 4 months ago

10% w/w solution of glucose in water means that 10 g of glucose in present in 100 g of the solution i.e., 10 g of glucose is present in (100 - 10) g = 90 g of water.
Molar mass of glucose {tex}\left( {{C_6}{H_{12}}{O_6}} \right) = (6 \times 12 )+( 12 \times 1) +( 6 \times 16 )= 180{\rm{ }}g{\rm{ }}mo{l^{ - 1}}{/tex}
Then, number of moles of glucose = {tex}\frac{{10}}{{180}}mol{/tex}
= 0.056 mol
Molality of solution = {tex}\frac{{0.056\,mol}}{{0.09\,kg}}{/tex} = 0.62
Number of moles of water = {tex}\frac{{90\,g}}{{18\,g\,mo{l^{ - 1}}}}{/tex}
= 5 mol
Mole fraction of glucose {tex}({x_g}) = \frac{{0.056}}{{0.056 + 5}}{/tex}
= 0.011
And, mole fraction of water {tex}{x_w} = 1 - {x_g}{/tex}
= 1 - 0.011
= 0.989
If the density of the solution is {tex}1.2\,g\,m{l^{ - 1}}{/tex}, then the volume of the 100 g solution can be given as:
{tex} = \frac{{100\,g}}{{1.2\,g\,m{l^{ - 1}}}}{/tex}
= 83.33 mL
{tex} = 83.33 \times {10^{ - 3}}L{/tex}
{tex}\therefore {/tex} Molarity of the solution = {tex}\frac{{0.056\,mol}}{{83.33 \times {{10}^{ - 3}}L}}{/tex}
=0.67 M

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What is the spectrum of hydrogen????

Posted by Sudhir Kumar Nishad 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Mehak Gautam 6 years, 4 months ago

The emission spectrum of atomic hydrogen has been divided into a number of spectral series, with wavelengths given by the Rydberg formula.

3Thank You

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Which one of the following contains highest number of significant figures 1.0.2 2)0.002 3)0.20 4)0.2000

Posted by Sabira Chachu 6 years, 4 months ago

CBSE > Class 11 > Chemistry

4 answers

Tannu Sharma 6 years, 4 months ago

0.2000 has highest no. of significant figures

Daisy Elezabath 6 years, 4 months ago

4 )0.2000 have more sig. Figures

Aayan Hussain 6 years, 4 months ago

Harender Singh 6 years, 4 months ago

4 have highest significant figures

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Can u explain me MOT of oxygen

Posted by Jheel Tippan 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Suplex City ?? 6 years, 4 months ago

Molecularorbiral theory

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I am not able to understand ch4 piz help me

Posted by Har Deep 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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Investigation of the foaming capacity of different washing soaps and the effect of addition of sodium carbonate on it

Posted by Aman Rajput 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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Compare vanderwaal forces in the fallwing (a) cl- HBr (b) Br H-H (B) (a) Hcl- Hcl (b)cl- ccl4(c) H2 HBr

Posted by Archana Pandey 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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why anion is greater than cation

Posted by Anam Khan 6 years, 4 months ago

CBSE > Class 11 > Chemistry

4 answers

Aayan Hussain 6 years, 4 months ago

Anion is negative charge which gain electron but cation loss elctron

Sapshita Yadav 6 years, 4 months ago

Becz Cation always loses electron.So the positive charge.thats why anion is greater than cation.

Rahul Raj 6 years, 4 months ago

Are u talking in terms of atomic radii.....

Robinpreet Kaur 6 years, 4 months ago

Because anions are negatively charged whereas cations are positively charged.OKKKKKK

ANSWER

Why c2 doeant exist?

Posted by Ishita Jindal 6 years, 4 months ago

CBSE > Class 11 > Chemistry

2 answers

Ishita Jindal 6 years, 4 months ago

Can i get some more reasons

Drishti Arora 6 years, 4 months ago

Because carbon is tetravalent and it is energetically not favourable to gain or lose 4 electrons at a time.. That's why C2 doesn't exist....

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What is line spectra or atomic spectra??

Posted by Khanikaa Vijayakumar 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 4 months ago

Atomic Spectra:

When an electron jumps amongst energy levels in an atom, energy is emitted or absorbed in the form of electromagnetic radiations and these radiations produce a spectral lines of frequencies(or wavelength) associated with an atom, called atomic spectra
Spectroscopy is the learning and examination emission and absorption spectra associated with an atom to determine its properties
Spectral lines are the bright and dark line series that constitute the spectrum associated with an atom

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delta E=0 THEN FIRST LAW OF THERMODYNAMIC WILL CHANGE

Posted by Krishna Tiwari 6 years, 4 months ago

CBSE > Class 11 > Chemistry

0 answers

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What is solubility and solubility product

Posted by Green Bandage 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 4 months ago

A substance's solubility product, K_sp, is the mathematical product of its dissolved ion concentrations with each concentration raised to the power of their stoichiometric coefficients.
For example the solubility product of ionic compound Ag₂S is
K_sp=[Ag⁺]²[S^-2]

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Test for nitrogen

Posted by Sampathkumar Rajendran 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Mehak Gautam 6 years, 4 months ago

Lassaigne's test is used to detect the presence of Nitrogen .

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What is trends

Posted by Anushka Srivastava 6 years, 4 months ago

CBSE > Class 11 > Chemistry

1 answers

Mehak Gautam 6 years, 4 months ago

Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Major periodic trends include electronegativity, ionization energy, metalic character , ionic radius etc.

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How to learn Chemistry easily

Posted by Shriman Akash 6 years, 4 months ago

CBSE > Class 11 > Chemistry

8 answers

Shubham Kumar 6 years, 4 months ago

By visualisation the the concept of chemistry

Drishti Arora 6 years, 4 months ago

Firstly throw the fear from ur mind out that chemistry is tough... Try to tell ur mind that it's too easy and then after sometime, of studying this subject by considering it easy, u will really feel that it's too easy.. ###the same happened with me too. I thought that physics Is a tough subject bt no.. When I started studying physics I realised, it is more easier than anything.. ##try this once.. U will surely get the results in ur favour..

Robinpreet Kaur 6 years, 4 months ago

Yaar concentrate and understand every concept seriously OK KEEP IT UP WITH CHEMISTRY

Himanshu Yadav 6 years, 4 months ago

By leaving it Don't try to learn it just try to leave it or simply understand the concept and then use that practically

Prashant Yadav 6 years, 4 months ago

You can learn chemistry in a easy way by reading every concept clearly and take the help pf your teacher also

Ashutosh Vishwakarma 6 years, 4 months ago

Chemistry is learn by clear concept for every chaptres

Rishvanth Rajaa 6 years, 4 months ago

To learn chemistry ,first you have to like the both chemistry teacher and subject

Srishti ? 6 years, 4 months ago

It is not easy to learn chemistry i hate chem.???

4Thank You

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What is ionisation potential

Posted by Pranshu Gupta 6 years, 4 months ago

CBSE > Class 11 > Chemistry

2 answers

Himanshu Yadav 6 years, 4 months ago

The energy required to remove an e- from outermost shell of of ionized gaseous atom is known as ionization enthalpy or potential

Mehak Gautam 6 years, 4 months ago

According to ionization potential , the energy to remove an electron from the neutral atom. It generally increases across a row on the periodic maximum for the noble gases which have closed shells.

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Wht is hyberdation

Posted by Deep Sharma 6 years, 4 months ago

CBSE > Class 11 > Chemistry

3 answers

Anam Khan 6 years, 4 months ago

intermixing of orbital is known as hybridization

Yogita Ingle 6 years, 4 months ago

Hybridization is defined as the mixing of the atomic orbitals belonging to the same atom but having slightly different energies so that a redistribution of energy takes place between them resulting in the formation of new orbitals of equal energies and identical shapes. The new orbitals thus formed are known as hybrid orbitals.