(a) Arrange the following in the order of property indicated for each set :(I) F_2,Cl_2 , Br_2 , I_2 - Increasing bond dissociation enthalpy. (II ) HF, HCI, HBr, HI – Decreasing acid strength. (III) NH_3, PH_3, AsH_3 , SbH_3, BiH_3 - Decreasing base strength. (b) Write the conditions to maximize the yield of H_2 SO_4 by contact process.

(a) Arrange the following in the order of property indicated for each

1.	(a) Arrange the following in the order of property indicated for each set :(I) F_2,Cl_2 , Br_2 , I_2 - Increasing bond dissociation enthalpy. (II ) HF, HCI, HBr, HI – Decreasing acid strength. (III) NH_3, PH_3, AsH_3 , SbH_3, BiH_3 - Decreasing base strength. (b) Write the conditions to maximize the yield of H_2 SO_4 by contact process.
Answer» Solution :(a)(I )increasingbonddissociationenthalpy `I_2 lt F_2 lt Br_2 lt Cl_2` (ii) Decreasingacidstrength `HI GT HBr gtHCIgtHF ` `(iii) ` Decreasingbasestrength ` NH_3 gt PH_3gt AsH_3gt SbH_3gt BiH_3` (b)conditionsfor maximumyieldof `H_2 SO_4 `bycontact PROCESS (i )Low temperature- 720K (ii) HIGHPRESSURE -2atm (iii)purityof gases ( IV) Presenceof acatalyst`Pt //V_2 O_3` ` (v ) ` An excess of ` O_2 `