Answer:rubidium is the second most reactive metal so it is more reactive than hydrogen
Explanation:
Phosphoric Acid - The last answer choice
H₂O₂ → <span> O</span>₂ +<span> H</span>₂<span>O
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Since the hydrogen peroxide (H₂O₂ ) is being broken down into two constituents (O₂ and H₂O) then this therefore means that this type of reaction would be a DECOMPOSITION reaction.