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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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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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….$$NH3$$>$$PH3$$>$$AsH3$$>$$SbH3$$>$$BiH3$$ ;

Compound	NH₃	PH₃	AsH₃	SbH₃
$∆_{diss} (E - H) / kJ {mol}^{- 1}$	389	322	297	255

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

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