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For the hypothetical reaction A(2)(g) +...

For the hypothetical reaction `A_(2)(g) + B_(2)(g) hArr 2AB(g)`
If `Delta_(r)G^(@)` and `Delta_(r)S^(@)` are `20 JK^(-1)mol^(-1)` respectively at `200` K.
`Delta_(r)C_(p)` is `20 JK^(-1) mol^(-1)` then `Delta_(r)H^(@) "at" 400 K ` is :

A

20 kJ/mol

B

7.98 kJ/mol

C

28 kJ/mol

D

16 kJ/mol

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The correct Answer is:
A
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