Question

Why does Magnesium float on water? ​

Answer 1

Answer:

The hydrogen gas evolved due to this reaction sticks on the surface of magnesium ribbon making it float in hot water.

Answer 2

Answer:

$\huge\bold\star \: \bf{\underline\mathcal\green{answer}}$

The hydrogen gas evolved when magnesium reacts with water doesn't catch fire because the heat developed is very low. But hydrogen gas comes out as bubbles and sticks to the surface of magnesium ribbon.

As a result the remaining magnesium ribbon floats on water.

Hope this could help you..!!