Which of the following reactions is NOT entro | vedclass

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(C) In extractive metallurgy,a reaction is entropy-driven if the change in entropy $(\Delta S)$ is positive,which usually occurs when the number of mo

Vedclass · Accepted Answer

$Cu_{2}S + O_{2(g)} 	o Cu_{2}O + SO_{2(g)}$

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(C) In extractive metallurgy,a reaction is entropy-driven if the change in entropy $(\Delta S)$ is positive,which usually occurs when the number of moles of gaseous products is greater than the number of moles of gaseous reactants.$A$: $CaCO_{3} \cdot MgCO_{3(s)} 	o CaO_{(s)} + MgO_{(s)} + 2CO_{2(g)}$. Here,$\Delta n_g = 2 - 0 = 2 > 0$. Entropy increases.$B$: $C_{(s)} + CO_{2(g)} 	o 2CO_{(g)}$. Here,$\Delta n_g = 2 - 1 = 1 > 0$. Entropy increases.$C$: $2Cu_{2}S + 3O_{2(g)} 	o 2Cu_{2}O + 2SO_{2(g)}$. Here,$\Delta n_g = 2 - 3 = -1 $D$: $Ni(CO)_{4(g)} 	o Ni_{(s)} + 4CO_{(g)}$. Here,$\Delta n_g = 4 - 1 = 3 > 0$. Entropy increases.Since reaction $C$ results in a decrease in the number of gaseous moles,it is not entropy-driven.

Column-$I$	Column-$II$
$P$. Nitriding	$I$. Process of heating steel to redness and then cooling it very slowly
$Q$. Annealing	$II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel
$R$. Tempering	$III$. Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
$S$. Quenching	$IV$. Process of heating quenched steel to a temperature well below redness and then cooling it slowly

Which of the following reactions is $NOT$ entropy-driven with reference to extractive metallurgy? (unbalanced reactions)

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