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Câu hỏi: Cho Zn dư vào dung dịch $AgN{{O}_{3}},Cu{{\left( N{{O}_{3}} \right)}_{2}},Fe{{\left( N{{O}_{3}} \right)}_{3}}$. Số phản ứng hóa học xảy ra:
A. 1.
B. 2.
C. 3.
D. 4.
A. 1.
B. 2.
C. 3.
D. 4.
$\begin{aligned}
& Zn+2Fe{{\left( N{{O}_{3}} \right)}_{3}}\to 2Fe{{\left( N{{O}_{3}} \right)}_{2}}+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+Cu{{\left( N{{O}_{3}} \right)}_{2}}\to Cu+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+2AgN{{O}_{3}}\to 2Ag+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+Fe{{\left( N{{O}_{3}} \right)}_{2}}\to Fe+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
\end{aligned}$
& Zn+2Fe{{\left( N{{O}_{3}} \right)}_{3}}\to 2Fe{{\left( N{{O}_{3}} \right)}_{2}}+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+Cu{{\left( N{{O}_{3}} \right)}_{2}}\to Cu+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+2AgN{{O}_{3}}\to 2Ag+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
& Zn+Fe{{\left( N{{O}_{3}} \right)}_{2}}\to Fe+Zn{{\left( N{{O}_{3}} \right)}_{2}} \\
\end{aligned}$
Đáp án D.