Which of the following equations is not actually observed?

1. $4 \mathrm{Sn}+\underset{\text { (dilute) }}{10 \mathrm{HNO}_{3}} ightarrow 4 \mathrm{Sn}\left(\mathrm{NO}_{3}ight)_{2}+\mathrm{NH}_{4} \mathrm{NO}_{3}+3 \mathrm{H}_{2} \mathrm{O}$
2. $3 \mathrm{Sn}+\underset{\text { (dilute) }}{8 \mathrm{HNO}_{3}} ightarrow 3 \mathrm{Sn}\left(\mathrm{NO}_{3}ight)_{2}+2 \mathrm{NO}+4 \mathrm{H}_{2} \mathrm{O}$
3. $\begin{aligned} \mathrm{Sn}+& 2 \mathrm{HCl} ightarrow \mathrm{SnCl}_{2}+\mathrm{H}_{2} \\ &(\mathrm{conc} .) \end{aligned}$
4. $\mathrm{Sn}+2 \underset{\text { (conc.) }}{2\mathrm{H}_{2}} \mathrm{SO}_{4} ightarrow \mathrm{SnSO}_{4}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{SO}_{2}$

Solution

Asked in: JEE-TOPICTESTS-CHEMISTRY

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