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# Which of the following equations is not actually observed?

$\begin{array}{1 1}4Sn+10HNO_3(dilute)\rightarrow 4Sn(NO_3)_2+NH_4NO_3+3H_2O\\3Sn+8HNO_3(dilute)\rightarrow 3Sn(NO_3)_2+2NO+4H_2O\\Sn+2HCl(conc)\rightarrow SnCl_2+H_2\\Sn+2H_2SO_4(conc)\rightarrow SnSO_4+2H_2O+SO_2\end{array}$

Answer : $3Sn+8HNO_3(dilute)\rightarrow 3Sn(NO_3)_2+2NO+4H_2O$
$4Sn+10HNO_3(dilute)\rightarrow 4Sn(NO_3)_2+NH_4NO_3+3H_2O$