In which reaction would an increase in pressure at constant temperature have no effect on the relative amounts of the subtances present in the equilibrium mixture? All subtances are gases.
a) 2 NO + O2 ⇌ 2 NO2 + heat
b) heat + N2 + O2 ⇌ 2 NO
c) N2 + 3 H2 ⇌ 2 NH3 + heat
d) 2 CO + O2 ⇌ 2 CO2 + heat
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