(a)Account for the following : (i)The acidic strength decreases in the order `HCl gt H_(2)S gt PH_(3)` (ii)Tendency to form pentahalides decreases down the group in group 15 of the periodic table. (b)Complete the following chemical equations. : (i)`P_(4)+SO_(2)Cl_(2)to` (ii)`XeF_(2)+H_(2)O to` (iii)`I_(2)+underset(("conc"))(HNO_(3)) to`

(a)Account for the following : (i)The acidic strength decreases in the

1.	(a)Account for the following : (i)The acidic strength decreases in the order `HCl gt H_(2)S gt PH_(3)` (ii)Tendency to form pentahalides decreases down the group in group 15 of the periodic table. (b)Complete the following chemical equations. : (i)`P_(4)+SO_(2)Cl_(2)to` (ii)`XeF_(2)+H_(2)O to` (iii)`I_(2)+underset(("conc"))(HNO_(3)) to`
Answer» Correct Answer - (a)(i)HCl is stronger acid than HF.The acid strength of hydrogen halide is `HFltHClltHBrltHI`. (ii)Element of this group form both ionic and covalent compounds in +3 oxidation state.In net shell, the covalent character decreases in the order : `NgtPgtAsgtSbgtBi`. Due to inert pair effect. (b)(i)`P_(4)+10 SO_(2)Cl_(2)tounderset("Phosphorus pentachloride")(4PCl_(5)+10 SO_(2))` (ii)`2XeF_(2)+H_(2)Oto2Xe+4HF+O_(2)` (iii)underset(("conc."))(`I_(2)+10HNO_(3))tounderset("Iodine to Iodine acid")(2HIO_(3)+10NO_(2)+)4H_(2)O`

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