Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

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#Question id: 19975

#XL - P Chemistry

The work function of a metal is 4.2 eV. If radiations of 2000 A⁰ fall on the metal then the kinetic energy of the fastest photo electron is

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#Question id: 19976

#XL - P Chemistry

A certain metal when irradiated to light ( = 3.2 × 1016 Hz) emits photoelectrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light ( = 2.0 × 10¹⁶Hz). The of metal

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#Question id: 19977

#XL - P Chemistry

The ratio of the radial of the first three Bohr orbit in H atom is

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#Question id: 19978

#XL - P Chemistry

Which of the following molecule has lowest bond space angle ?

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#Question id: 19979

#XL - P Chemistry

Which orbital has highest energy ?

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#Question id: 19980

#XL - P Chemistry

Which is the paramagnetic species ?