Question

Which should give the most vigorous reaction when dropped in water?

ос
O Zn
OK
O Ca
O Si

Answer 1

Calcium (Ca) should give the most vigorous reaction when dropped in water.

Step-by-step explanation:

Among the given elements, Ca should give the most vigorous reaction when dropped in water.

Calcium is an alkali earth metal that reacts vigorously with water to produce calcium hydroxide and hydrogen gas. The reaction is as follows:

Ca + 2H2O -> Ca(OH)2 + H2

Learn more about Reactivity of elements in water