What is the chemical formula for the compound formed between chromium(vi) and fluorine?

Zinc + lead(ii) nitrate yield zinc nitrate + leadwhat's the chemical equation for this?

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Ineed to find the answer of this question because i dont understand it