which of the following pairs of elements would most likely form a salt?   question 2 options: na and ca cl and fl ca and br h and he

Equal volumes of h2 and o2 are placed in a balloon and then ignited. assuming that the reaction goes to completion, which gas will remain in excess? 2h2 + o2 → 2h2o a. both are in equal proportion b. oxygen c. water d. hydrogen