Shristy posted an Question
August 29, 2020 • 02:37 am 30 points
  • IIT JAM
  • Chemistry (CY)

(a) bf3> nh;> nf;> ph3 (6) ph3> bf3s nfs nhs (c) bf3> ph3> nh> nf3 30 (d) nh3> nf;> bf3> ph the correct order of the boiling points of the compounds is: (a) ch>

(a) BF3> NH;> NF;> PH3 (6) PH3> BF3S NFS NHs (c) BF3> PH3> NH> NF3 30 (d) NH3> NF;> BF3> PH The correct order of the boiling points of the compounds is: (a) CH> SiH,> SnHi> GeHa (b) SiH> CH> GeH> SnH4 (c) SnH> GeH4> CH> SiH4 (d) SnHa> GeH> SiHa> CH4

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    Dinesh khalmaniya 1

    option D

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    here down the group vanderwall force of attraction increase so BP also increased

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    vanderwall force of attraction depend on molecule weight, down the group weight increase so VF of attraction increase

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    got it?

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    reason

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    sir what about this line ?

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    Priyanshu kumar Best Answer

    Option D

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    see

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    got this shristy??

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    Hope you get this

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    but here it is decreases ??

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    here vanderwaal forces is there

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    which increases down the grp with increases in molecular mass

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    So BP increases

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    now clear shristy..??

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    then sir what about this line ?

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    it decreases down the group in grp 1 n 2 elements

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    https://www.quora.com/What-is-the-trend-of-melting-and-boiling-points-in-a-periodic-table/answer/Roshan-Daga-1?ch=10&share=1b06481b&srid=XRpEY read this shristy

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    sir isme b yhi diya h ???

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    wait shristy

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    see this

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    for BP of hydrides check this

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    exception arises in some trends....

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    Inorganic chem have lots of exceptions ...so make charts of exceptions and remember that .

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    so sir this concept is wrong ??

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    this is not general trends...you can't consider this in general

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    with exceptions these are right....based on forces of attraction

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