The reaction that proceeds in the forward direction is:
A
SnCl4+Hg2Cl2⟶SnCl2+2HgCl2
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B
NH4Cl+NaOH⟶H2O+NH3+NaCl
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C
Mn2++2H2O+Cl2⟶MnO2+4H++2Cl−
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D
S4O2−6+2I−⟶2S2O2−3+I2
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Solution
The correct option is BNH4Cl+NaOH⟶H2O+NH3+NaCl For a reaction to proceed in forward direction, it has to be spontaneous.
A spontaneous reaction is characterized by increase in entropy.
From
the given reactions only option B shows an increase in
entropy, because the number of molecules in the product is higher than that
of the reactants.