how can we know that the given reaction is reversible or not?
for ex:-
Q.Which of the following is reversible reaction?
(A) Pb(NO3)2(aq) + 2NaI(aq) = PbI2(s) + 2NaNO3(aq)
(B) AgNO3(aq) + HCl(aq) = AgCl(s) + HNO3(aq)
(C)2Na(s) + 2H2O(l) = 2NaOH + H2(g)
(D) KNO3(aq) + NaCl(aq) = KCl(aq) + NaNO3(aq)