Question

Which of the following is an example of a decomposition reaction? numbers in parenthesis are subscripts

1. 2Cr + 3Cl(2) yields 2CrCl(3)
2.CrO3 yields Cr(2)O(3) + O(2)
3. Ca + 2H(2)O yields Ca(OH)(2) + H(2)
4. 2HCl + Ca(OH)(2) yields CaCl(2) + 2H(2)O

Answer 1

Pretty sure it's 3, since the hydrogen is broken down.