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L,A,Z,D and J are 15th group elements belonging to Modern periodic table. The correct trend of dissociation constant(ka) of hydrides is LH3 > AH3 > ZH3 > DH3 > JH3. The element ‘A’ in the sequence is

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By Expert Faculty of Sri Chaitanya
a
Sb
b
As
c
P
d
Bi
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detailed solution

Correct option is A

Down the group as the size of the atom increases affinity of hydrogen towards central atom decreases. Thereforea) X-H bond enthalpy decreases….N-H>P-H>As-H>Sb-H>Bi-H ;b) Thermal stability decreases….NH3>PH3>AsH3>SbH3>BiH3 ;NH3 is exothermic product,remaining four hydrides are endothermic products.c) Reducing power increases….NH3PH3>AsH3>SbH3>BiH3 ;Down the group as vanderwaal's forces increasesMelting and boiling points increasesExpected BP and MP….NH3PH3>AsH3>SbH3>BiH3 ;Down the group as the size of central atom increases, electron density on central atom decreases. Thusa) Basicity decreases,Lewis base strength decreases…..NH3>PH3>AsH3>SbH3>BiH3 ;b) Electron donating power decreases……NH3>PH3>AsH3>SbH3>BiH3 ;c) Ligand strength and ability to form dative bond decreases….NH3>PH3>AsH3>SbH3>BiH3 ;


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Similar Questions

Bond dissociation enthalpy of E - H (E = element) bonds is given below, which of the compounds will act as strongest reducing agent?

CompoundNH3PH3AsH3SbH3
dissE-H/kJ mol-1389322297255

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