The image contains three chemical equations written on a blackboard. The task is to write them down in a clear and organized manner, potentially balancing them if that's implied by the context of a chemistry lesson.

Химические реакции:

1. \( \text{Al} + \text{HNO}_3 \rightarrow \text{Al(NO}_3\text{)}_3 + \text{N}_2 + \text{H}_2\text{O} \)
2. \( \text{PH}_3 + \text{HNO}_3 \rightarrow \text{H}_3\text{PO}_4 + \text{NO}_2 + \text{H}_2\text{O} \)
3. \( \text{KMnO}_4 + \text{SiH}_4 \rightarrow \text{SiO}_2 + \text{MnO}_2 + \text{KOH} + \text{H}_2\text{O} \)