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

E3 – E2 = hv = hc/λ – 2.41 ´ 10–12 – (– 5.42 ´ 10–12) = 6.626 x 10-27 x 3 x 1010/ λ Thus, λ = 6.626 x 10-27 x 3 x 1010 / 3.01 x 10-12 = 6.604 x 10–5 cm = 6.604 x 10–5 x 108 = 6604 Å

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When will class 10 result come ??? Plz tell me okk i thought i might be the topper !!!

Posted by Abhay Chauhan !!! 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

25th of December 2018... and you will gona top. ?

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What is molarity explain simply

Posted by Saksham Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

5 answers

Aman Kumar 7 years, 6 months ago

Never mind

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

ohhh noooo?... sorry sorry

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Aman Kumar 7 years, 6 months ago

Darshanaa , he had asked about "Molarity" not molality.

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

Molality is a way of indicating the concentration of a solute dissolved in a solution. It is calculated by dividing the moles of solute by the mass of the solvent in kg. molality=mole of solute/ kg of solvent.

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Aman Kumar 7 years, 6 months ago

Molarity means no. of moles of solute present in 1 litre of solution.

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Calculate the molecular formula of anhydrous and crystalline compound. The molecular mass of anhydrous compound is 120u

Posted by Sanjeevani Sharma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is elecron gain enthalpy

Posted by Mehak Thakur 7 years, 6 months ago

CBSE > Class 11 > Chemistry

4 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

in my knowledge.. these are the isolated gaseous atom.

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

sodium, potassium, boron, fluorine. ?

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Aman Kumar 7 years, 6 months ago

Ok plz give me the example of isolated gaseous atom??

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

Electron gain enthalpy is the energy released when an electron is added to an isolated gaseous atom.

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Find Molality of 30 % w/w h2so4 Give with solution

Posted by Raj Goyani 7 years, 6 months ago

CBSE > Class 11 > Chemistry

4 answers

Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

H2SO4= 98 weight of 30% of H2SO4 soln = 1.218 g = 1000 ml * 1.218 g/ml =1.218g (v*d) wt. of H2SO4 (solute) = 1218*30/100 = 365.4 g wt. of H20 (solvent) = 1218-365.4 now , total wt. of H2SO4 = 365.4+1127 = 1492.4 g 70% of H2SO4 SOln = 1000 ml * 1.61 g/cc =1610g wt. of H2SO4 (solute) = 1610*70/100 = 1127 g wt. of H2O (solvent) = 1610-1127 = 483 g now, tota wt. of H2O (Solvent)= 852.6 + 483 = 1335.6 g finalllllyyyy, molarity = wt*100/molecular wt.* wt. of solvent = 1492.4*1000/98*1335.6 = 11.4

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Aman Kumar 7 years, 6 months ago

Molality= 30 ×1000/98× 100 =300/98= 3.061 Ans...

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

11. 4

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Kushal Prajapat 7 years, 6 months ago

75÷7 of water

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Behavior of real gases

Posted by Udai Bhanu Chanda 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

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What is molar mass of fe2o3

Posted by Raj Goyani 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Kushal Prajapat 7 years, 6 months ago

160

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Shubhangi Mishra 7 years, 6 months ago

Molar mass of fe2o3 is 160

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In three moles of ethane calculate no of Corbin atoms

Posted by S Gautam 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Kushal Prajapat 7 years, 6 months ago

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Aman Kumar 7 years, 6 months ago

We know that ethane= C2 H6..... Therefore, 1 mole of C2H6 contain 2 moles of carbon( bcoz carbon is 2 in the formula of ethane)..... ATQ, ..... =>3×2= 6... Therefore , 6 is the ans....

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Splitting of spectral line under magnetic field is called a)German effect b)stark effect c)photoelectric effect d)polarization

Posted by Tripti Sharma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

6 answers

Tripti Sharma 7 years, 6 months ago

Good darshana

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Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

Splitting of spectral lines under a magnetic field is called the Zeeman effect.

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Aman Kumar 7 years, 6 months ago

Oookkk

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Tripti Sharma 7 years, 6 months ago

Stark effect is for electric field but for magnetic it is a) zeeman effect

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Aman Kumar 7 years, 6 months ago

I think stark effect not conformed

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Tripti Sharma 7 years, 6 months ago

Sorry *a)zeeman effect

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Number of waves produced in one complete revolution in nth orbit is a)n b)n^2 c)n+1 d)2n+1

Posted by Tripti Sharma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

5 answers

Tripti Sharma 7 years, 6 months ago

U can and u will keep giving good answers.

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Aman Kumar 7 years, 6 months ago

I m happy that I had given at least a single correct ans to u

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Tripti Sharma 7 years, 6 months ago

Absolutely right and it's good u answered

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Nancy Rajput 7 years, 6 months ago

its n answer (a)

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Aman Kumar 7 years, 6 months ago

I think the ans is n

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The highest wavelength results when an electron jumps from n=6 to n=???

Posted by Tripti Sharma 7 years, 6 months ago

CBSE > Class 11 > Chemistry

7 answers

Aman Kumar 7 years, 6 months ago

Nice question , sry 4 wrong ans

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Tripti Sharma 7 years, 6 months ago

Answer is 5

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Tripti Sharma 7 years, 6 months ago

A man have u left

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Nancy Rajput 7 years, 6 months ago

may be 2

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Tripti Sharma 7 years, 6 months ago

Good attempt

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Tripti Sharma 7 years, 6 months ago

Sorry but u r wrong the answer is 5 as coming from 6 to 5 energy is minimum and hence wavelength becomes maximum

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Aman Kumar 7 years, 6 months ago

Not sure but may be n=1

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Calculate the molarity of ethanol in water in which the mole fraction of Ethanol is 0.040 (assume the density of water to be one)

Posted by Saurabh Tiwari 7 years, 6 months ago

CBSE > Class 11 > Chemistry

6 answers

Nancy Rajput 7 years, 6 months ago

hmm

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Tripti Sharma 7 years, 6 months ago

U first simply gave the answer but then u felt unsatisfied and gave the whole answer that's nice

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Nancy Rajput 7 years, 6 months ago

thanks

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Tripti Sharma 7 years, 6 months ago

Nice nancy

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Nancy Rajput 7 years, 6 months ago

mole of ethanol =0.04 mole of water =1-0.040 =0.960 mole mole of ethanol=0.040×46 =1.840g mole of water=0.960×18 =17.3g mole of solution =17.3+1.84 =19.1g volume=mass/density =19.10/1 =19.1ml =0.0191 l M=0.040/0.0191 =2.1M

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Nancy Rajput 7 years, 6 months ago

2.1M

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What is the relation between kinetic energy and frequency of the photoelectrons?

Posted by Ʌɐpɐʎ Ɐuɐɥsɹɐp . 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Aman Kumar 7 years, 6 months ago

Kinetic energy of ejected electrondepends upon the freq. of the radiation falls on a metal surface.

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How is 0.5 ml of NaOH different from 0.5M of NaOH

Posted by Mohammad Sohil 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Aman Kumar 7 years, 6 months ago

0.5 M means 0.5 moles of NaOH present in 1000 ml of solution but 0.5 ml of NaOH is only the quantity of NaOH.... Soo... I think this may be the answer

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Is the data given in the green boxes in science books important to pick in our notes? Urgent. .........

Posted by Mitali Singh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

3 answers

Mitali Singh 7 years, 6 months ago

Thanks but I'm a bit confused to note it down or not...... It is like a data and, record of an element..... You can also check it on pg. no. 8 reference standard. Please tell me is it important by any competitive exams point of view?

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Akash Choudhary Dav Gandhinagar 7 years, 6 months ago

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Aman Kumar 7 years, 6 months ago

If data in green boxes it is related to topic and seems to be important to u then u must pick in our notes....

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Magnetic radiation oscillating means?

Posted by Jiten Sehg 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is the origin of chemical energy?

Posted by Manish Jaat 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 7 years, 6 months ago

Chemical energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic. Reactions that require an input of heat to proceed may store some of that energy as chemical energy in newly formed bonds. The chemical energy in food is converted by the body into mechanical energy and heat. The chemical energy in coal is converted into electrical energy at a power plant. The chemical energy in a battery can also supply electrical power by means of electrolysis.

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BERZELIUS HYPOTHESIS ???

Posted by Harsh Kapoor ❤ 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Navneet Singh 7 years, 6 months ago

Berzelius a Swedish chemist, gave a hypothesis called Berzelius hypothesis which states that : Equal volume of all gases under similar conditions of temperature and pressure contain equal number of atoms.

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How to find number of electrons in Mg where m=0.

Posted by Shubham Parikh 7 years, 6 months ago

CBSE > Class 11 > Chemistry

3 answers

Kushal Prajapat 7 years, 6 months ago

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Aman Kumar 7 years, 6 months ago

Number of electron will be 2.

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Khushbu J 7 years, 6 months ago

I too don't know!

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Distinguish between homogenous and heterogenous mixture

Posted by Hemant Tiwari 7 years, 6 months ago

CBSE > Class 11 > Chemistry

2 answers

Mitali Singh 7 years, 6 months ago

In homogeneous mixture the components geta completely mixed and we can't easily separate it's components so it's composition is uniform throughout . In heterogeneous mixture the composition is not uniform this means that we can easily separate it's components and sometimes the different components can be observed.

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Shravan Kumar 7 years, 6 months ago

Composition is complete in homogeneous mixture

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What is the electronic configuration of gadolinium

Posted by Kushal Prajapat 7 years, 6 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Hi frnds explain me the molecular orbital theory

Posted by Shaista Parveen 7 years, 6 months ago

CBSE > Class 11 > Chemistry

1 answers

Nancy Rajput 7 years, 6 months ago

In molecules, electrons are present in the new orbitals called molecular orbitals. Like atomic orbitals molecular orbitals are also characterized by the set of quantum numbers. The atomic orbitals of nearly same energy and same symmetry can overlap to form molecular orbitals. Molecular orbitals are not associated to a particular atom but belong to the nuclei of all the atoms constituting the molecule ,so it is polycentric theory.

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Find the energy of radiation whose wave length is 6200 Amstrom units

Posted by Rambabu Rambabu 7 years, 6 months ago

CBSE > Class 11 > Chemistry