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Which of the following is a gas-evolution reaction?
A. 2 C2H6(l) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
B. NH4Cl(aq) + KOH(aq) → KCl(aq) + NH3(g) + H2O(l) 2
C. H2(g) + O2(g) → 2 H2O(g)
D. LiCl(aq) + NaNO3(aq) → LiNO3(aq) + NaCl(aq)
E. None of the above are gas-evolution reactions.

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jufsanabriasa

Answer:

B. NH₄Cl(aq) + KOH(aq) → KCl(aq) + NH₃(g) + H₂O(l)

Explanation:

A gas-evolution reaction is defined as a chemical reaction that produce a gas and where reactants are not in gaseous phase.

Thus, the reactions:

A. 2C₂H₆(l) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)  Is not a gas-evolution reaction because one reactant is a gas.

B. NH₄Cl(aq) + KOH(aq) → KCl(aq) + NH₃(g) + H₂O(l) Is a gas-evolution reaction because one product is the NH₃ that is a gas and reactants are not gases.

C. 2H₂(g) + O₂(g) → 2H₂O(g)  Is not a gas-evolution reaction because the reactants are gases

D. LiCl(aq) + NaNO₃(aq) → LiNO₃(aq) + NaCl(aq) Is not a gas-evolution reaction because there are not gases as products.

I hope it helps!

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