Which species will react with water most vigorously? #"A. Hydrogen"# #"B. Copper"# #"C. Calcium"# #"D. Potassium"#

1 Answer
Sep 11, 2017

Answer:

#"Option D"#

Explanation:

Potassium is an alkali metal, and will react very fiercely should a chunk be dropped into water - it is much more reactive than sodium.

#K(s) + H_2O(l) rarr KOH(aq) + 1/2H_2(g)uarr+Delta#

Calcium will react in this fashion more sluggishly, and hydrogen and copper are insufficiently reducing to react with water.