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

Uncertainty in velocity i,e. 45 ×2/ 100= 0.9ms^1 ∆x.∆p=h/4π ∆x .m∆v =h\ 4π ∆x= h/4πm∆v ∆x= 6.626×10^-34J/4×3.14×40g 10^-3kg× 0.9ms^-1 ∆x= 1.46×10^-33 m

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Can plz anyone tell me the ans of 31 st question of exercise of chapter 2? Plzzzzz???

Posted by Susmita Mandal 6 years, 5 months ago

CBSE > Class 11 > Chemistry

4 answers

Susmita Mandal 6 years, 5 months ago

The electronic configuration is wrong.....check it out Unnati.....plz

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Unnati Pragya 6 years, 5 months ago

A) Total no. of electron in an atom for a value of n=2n^2 For n= 4 Total number of electron=2(4)^2 The given element has a fully filled orbital as 1s^2 2s^2 2p^ 6 3s^2 3p^6 4s^2 3d^10 Hence all the electron are paired Number of electron (having n= 4 nd m ↓s =-1/2) =16 B) n= 3, l =0 indicate that the electron are present in the 3S orbital Therefore the number of electron having an equal to 3 and l equal to zero is 2

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Nishant Yadav 6 years, 5 months ago

Unknown

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Susmita Mandal 6 years, 5 months ago

I think it's wrong in this app

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Which orbit of be+³ has almost the same radius as that of the ground state H–atom

Posted by Akshayaa. S Akshayaa. S 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Susmita Mandal 6 years, 5 months ago

4 th orbit

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What is meant by concerned nucleus.

Posted by Jatin Garg???? 6 years, 5 months ago

CBSE > Class 11 > Chemistry

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Is solubility of lithium sodium potassium rubium cesium possible with chlorine??

Posted by Nikhil Shukla 6 years, 5 months ago

CBSE > Class 11 > Chemistry

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what do u mean by chemical equilibrium

Posted by Inshad Sheikh Ahmad 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Inshad Sheikh Ahmad 6 years, 5 months ago

when the reaction reaches to a point where the concentration of reactants and products are unchanged with time because the forward and backward reactions are in same rate this phenomena is known as chemical equilibrium

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What is black hole radiation

Posted by Sachidanand Gupta 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Rahul Sanwal 6 years, 5 months ago

Energy is emitted or energy is absorbed by a black body radiation it mean black body is perfect emitter or absorber

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Molar mass kasa find out kara

Posted by Uday Kasana 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Devender Singh 6 years, 5 months ago

Like C6 h12 o6 so so first we have to take the atomic mass of carbon hydrogen and oxygen week we know that carbon atomic mass is 12 and hydrogen atomic mass is 1 and oxygen atomic mass is 16. Then we will multiply the atomic mass of carbon with it power 6 then we will multiply the the atomic mass of hydrogen with IT power 12 and then we will multiply the atomic mass of oxygen with IT power 6 answer is= 12 x 6 + 1 x 12 + 16 x 6 = 72 +12 +96= 180 so molar mass of C6 h12 o6 is 180

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Write the resonance structures for so3

Posted by Mallu Balurgi 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Uday Kasana 6 years, 5 months ago

Molar kasa find out karta ha

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Q. If accuracy percentage of speed of particle is given then what will be the value of del.v? Will it be given%of v or 100-given % of v?

Posted by Rupesh Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Nimesh Rathour 6 years, 5 months ago

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How to choose parent chain?

Posted by Manpreet Kaur 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Manpreet Kaur 6 years, 5 months ago

IUPAC naming?

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Why in auf bau Principle 4s filled first before 3d ?

Posted by Madan Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Garima Tayal 6 years, 5 months ago

Because of the n+l rule in this we have to check that which orbit have a greater n+l value where n is the principal quantum no..and l is the azimuthal quantum no....and it value is ...s=0,p=1,d=2,f=3.so 4+0=4 and 3+2=5 ....hence 3d>4s

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Divyansh Kumar 6 years, 5 months ago

Because of the n+l rule where n=the orbit and l=azimuthal quantum no.... So. In 4s, n=4 and l=s suborbit =0 .:. Using n+l rule, 4+0=4 Now in 3d, n=3 and l=d suborbit =2 .:. Using n+l rule, 3+2 =5 So, point to be noted is 1)s=0, p=1,d=2,and f=3 2)The the subshell with less energy will be filled first. Since, 4s has less energy i.e. 4,than 3d,i.e. 5, 4s is filled before 3d.....

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Structure of atoms... discovery of neutrons notes

Posted by Safreen Banu 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

Check revision notes here : https://mycbseguide.com/cbse-revision-notes.html

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Which book we will study to gain better marks in chemistry ...

Posted by Param Varshney 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Jitender Kumar 6 years, 5 months ago

I think you should prefer GRB chemistry

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Kritika Yadav 6 years, 5 months ago

Modern's abc

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Which book will study to score good marks for chemistry

Posted by Kala Babu 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Kritika Yadav 6 years, 5 months ago

Not avc,its abc

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Kritika Yadav 6 years, 5 months ago

Modern's avc

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What is mass of electron in gram and kg

Posted by Sumit Kumar 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Mahi ✌?? 6 years, 5 months ago

In kg ,mass of electron=9.10939×10‐³¹kg In gram,mass of electron =9.10939×10-²⁸g

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List out Bohr`s model of hydrogen atom

Posted by Tejas Anitha 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

Neils Bohr proposed a model of atom in 1912 to remove the drawbacks of Rutherford’s atomic model and to explain the structure of an atom in detail. The features of Bohr’s model of atom are given below:-
i) An electron revolves in the orbit of atom with well-defined energy.
ii) Energy of orbits increases from the inner shell to the outer shells i.e. energy of orbit nearest to the nucleus is the lowest.
iii) If energy is supplied to an electron, it moves from a lower orbit to a higher orbit. When an electron moves from a higher orbit (energy level) to a lower orbit (energy level), energy is radiated as electromagnetic waves.
iv) Each orbit or shell represents an energy level. Such orbits are represented as K,L,M,N,O (named starting from the centre of an atom).
v) The shell or orbits are associated with a certain amount of energy and energy of orbits/shells increases from the nucleus towards the valence shell.

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Chemical balance

Posted by Sonu Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry