1.

Which of the following do(es) not represent DeltaH formation of the product.

Answer»

`1/2 H_(2)(g)+1/2 Br_(2)(g)rarr HBr`<BR>`H_(2)(g)+Cl_(2)(g) rarr 2HCl`
`NH_(4)^(+)(g)+Cl^(-) (g) rarr NH_(4)Cl(s)`
`P_(4)("black")+5O_(2)(g) rarr P_(4)O_(10)(s)`

Solution :`A=Br_(2)` must be present in liquid STATE
`B=` Only FORMATION of one mole compound
`C=` Only elementry susbstances should present in the reactant SIDE.
`D=P_(4)` (white) is used


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