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Question

Chemistry Question on Equilibrium

An example of a reversible reaction is

A

Pb(NO3)2 (aq)+2Nal((aq)=Pbl2(s)+2NaNO3(aq)P b( NO_3)_2 \, ( aq) + 2Nal ( (aq) = Pbl_2(s) + 2NaNO_3(aq)

B

AgNO3(aq)+HC1(aq)=AgCl(s)+HNO3(aq)AgNO_3(aq) + HC1 (aq)= AgCl (s) + HNO_3(aq)

C

2Na(s)+2H2(O(l)=2NaOH(aq)+H2(g)2Na (s) + 2H_2( O (l)= 2NaOH (aq) + H_2(g)

D

KNO3(aq)+NaCl(aq)=KCl(aq)+NaNO3(aq) KNO_3(aq) + NaCl (aq) = KCl(aq) + NaNO_3(aq)

Answer

KNO3(aq)+NaCl(aq)=KCl(aq)+NaNO3(aq) KNO_3(aq) + NaCl (aq) = KCl(aq) + NaNO_3(aq)

Explanation

Solution

In reactions (a), (b) and (c), atleast one of the product is either insoluble precipitate or a gas that drive the reaction continuously to right and do not allow equilibrium to be established. Following is the reversible reaction
KNO3(aq)+NaCl(aq)=KCl(aq)+NaNO3(aq)KNO_3(aq) + NaCl (aq) = KCl(aq) + NaNO_3(aq)