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Which of the following process is endoth...

Which of the following process is endothermic?

A

`Na(g)+"le"^(-)rarrNa^(-)(g)`

B

`O^(+)(g)+"le"^(-)rarrO(g)`

C

`O^(-)(g)+"le"^(-)rarrO^(2-)(g)`

D

`S+"le"^(-)rarrS^(-)(g)`

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