For which of the following reaction, the unit of equilibrium constant (K<sub>c</sub>) is reciprocal of molar concentration (M<sup>-1</sup>):

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For which of the following reaction, the unit of equilibrium constant (Kc) is reciprocal of molar concentration (M-1):

3H2(g)⇌2H3N(g)

H2(g)+I2(g)⇌N2O4

2NO2(g)⇌N2O4(g)

H2(g)+O2(g)⇌2NOg