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1.

Select equation having endothermic step:

Answer»

`S^(-)(g) to S^(2-)(g)`
`NA^(+)(g) +Cl^(-)(g) to NaCl(s)`
`N(g) to N^(-)(g)`
`Al^(2+)(g) to Al^(3+)(g)`

ANSWER :A::C::D


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