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Asked by prakriti12oct | 27th Sep, 2019, 01:43: AM

Expert Answer:

Standard enthalpy of formation is zero of the elements in their standard state. Chlorine exists in Cl2(g) form in nature So it is standard form of Chlorine so the standard formation of heat will be zero. In other cases, Hg exists in liquid form, Br exists in liquid and  I exists in solid form in nature, so the standard enthalpy of formation cannot be zero for other given elements.

Answered by Ravi | 27th Sep, 2019, 07:34: PM