Which of the following reactions involve homogeneous equilibria and which involve heterogeneous equilibria?

$left parenthesis straight a right parenthesis space 2 straight N subscript 2 straight O left parenthesis straight g right parenthesis space space rightwards harpoon over leftwards harpoon space 2 straight N subscript 2 left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis left parenthesis straight b right parenthesis space space 2 NH subscript 3 left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space space straight N subscript 2 left parenthesis straight g right parenthesis space plus space 3 straight H subscript 2 left parenthesis straight g right parenthesis left parenthesis straight c right parenthesis space 2 Cu left parenthesis NO subscript 3 right parenthesis subscript 2 left parenthesis straight s right parenthesis space space rightwards harpoon over leftwards harpoon space space space 2 CuO left parenthesis straight s right parenthesis space plus space 4 NO subscript 2 left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis left parenthesis straight d right parenthesis space Fe to the power of 3 plus end exponent left parenthesis aq right parenthesis space plus space 3 OH left parenthesis aq right parenthesis space rightwards harpoon over leftwards harpoon space space space Fe left parenthesis OH right parenthesis subscript 3 left parenthesis straight s right parenthesis$

Solution

Homogeneous equilibria: (a) and (b)
Heterogeneous equilibria: (c) and (d).

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