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NaCl(aq) + AgNO3(aq)  AgCl(s) + NaNO3(aq)
Zn(s) + H2SO4(1) ZnSO4(aq) + H2(g)
CaCO3(s) CaO(s) + CO2(g)
C2H6(g)+72O2(g)  2CO2(g) + 3H2O(g) + Heat
ANS : 1
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