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(a) Arrange the following in the order o...

(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.

Text Solution

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(a) (I ) increasing bond dissociation enthalpy
`I_2 lt F_2 lt Br_2 lt Cl_2`
(ii) Decreasing acid strength
`HI gt HBr gt HCI gt HF `
`(iii) ` Decreasing base strength
` NH_3 gt PH_3 gt AsH_3 gt SbH_3 gt BiH_3`
(b) conditions for maximum yield of `H_2 SO_4 ` by contact process
(i ) Low temperature - 720 K
(ii) high pressure -2atm
(iii) purity of gases
( iv) Presence of a catalyst `Pt //V_2 O_3`
` (v ) ` An excess of ` O_2 `
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