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Which of the chemical reactions given below are wrong? Explain the reason.

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Which of the chemical reactions given below are wrong? Explain the reason.

a. Cu (s) + 2HCl (aq) → CuCl2 (aq) + H2 (g) 

b. Mg(s) + Pb(NO3)2 (aq) → Mg(NO3)2 (aq) + Mg (s)

c. 3Fe (s) + 4H2O (l) → Fe3O4 (s) + 4H2 (g)

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Equations (a) and (c) are wrong. 

a. Copper cannot displace hydrogen from acids because it is placed below hydrogen in the reactivity series. 

c. Fe reacts only with super heated steam. Fe does not react with water in liquid state.

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