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Physical Chemistry

Scorching goIITian

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19 Nov 2008 17:40:55 IST

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645

multiple choice.....

None

1.which one is odd here w.r.t. hydrogen spectrum-(a)balmer series(b)paschen series(c)fourier series(d)brackett series?

2.which wavelength is not associated with balmer series of hydrogen spectrum-(a)6561(b)4860(c)5646(d)3645?(values in angstrom)

3.which d-orbital has a diff. shape from rest all d-orbitals?

4.the radius of 1st Bohr's orbit in hydrogen atom is 0.053 nm.The radius of 2nd orbit in He+ wud be:(a)0.0265nm(b)0.530nm(c)0.1060nm(d)0.2120nm??

5.which of the following products in hydrogen atom are independent of the principal quantum number n?thesymbols has /have their usual meaning--(a)vn (b)Er (c)En (d)vr

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Comments (8)

rohit

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Joined: 1 Jul 2007

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19 Nov 2008 17:56:27 IST

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1.c)fourier series

2.d)3645 A (balmer series is the range of visible light(4000 - 7000A)

3 i think it is the orbital

4 c)0.1060 nm (n² / z)

5.could you give the full form of the symbols...

Scorching goIITian

Joined: 9 Oct 2008

Posts: 278

19 Nov 2008 18:07:40 IST

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can u plz explain y d 1st 1 is fourier.........??

sorry...but the ans 2 d 2nd 1 is 5646

ur ans 4 3rd 1 is correct but can u temme y it can't b d(x square- y square)

for d 5th question.........E is energy,v velocity and r radius...

rohit

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19 Nov 2008 18:26:30 IST

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5 th one is a and b

i think the fourier series is a mathematical series....it has nothing to do with with the spectrum of hydrogen

it is the orbital because there is a circular ring around the main dumbbell unlike the other 4 orbitals.

Scorching goIITian

Joined: 9 Oct 2008

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19 Nov 2008 18:28:50 IST

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how did u get d ans of the 5th question??

rohit

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19 Nov 2008 19:23:05 IST

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the velocity of an electron is the usual value (2.18 *10^8 cm/s) multiplied by Z / n

energy of an electron is the usual value (13.6 ev) into Z²/ n²

radius is n² / Z into the usual value

ishi obroi

Hot goIITian

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20 Nov 2008 02:39:20 IST

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in 5th what is Er and Vr

rumki chakraborty

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20 Nov 2008 06:50:48 IST

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Fourier series is a mathematical series, has nothing to do with H-spectrum

Scorching goIITian

Joined: 9 Oct 2008

Posts: 278

21 Nov 2008 19:31:11 IST

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then what is the correct answer 4 it??

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