"If a" vs "if any"

Hi there, I have provided some sentences below. What's the difference between "if a" and "if any" in the sentences. I think all of them are correct and mean the same thing. I don't know what the difference is. I always use them interchangeably in this kind of context. Can someone please tell me how I should choose the correct word?

1- If a/any student is found smoking in the classroom, he or she will be suspended from the school.

2- As per the new tax law, If a/any house is situated in a metropolitan city, 15 percent tax will be charged on the value of 'it'.


If there is anything ungrammatical in my post, please correct it. Smile
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