Question

Which of the following do(es) not represent `DeltaH` formation of the product.
A. `1/2 H_(2)(g)+1/2 Br_(2)(g)rarr HBr`
B. `H_(2)(g)+Cl_(2)(g) rarr 2HCl`
C. `NH_(4)^(+)(g)+Cl^(-) (g) rarr NH_(4)Cl(s)`
D. `P_(4)("black")+5O_(2)(g) rarr P_(4)O_(10)(s)`

Answer 1

Correct Answer - A::B::C::D
`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