Does sodium reacts more vigrously in hot water than cold water?why or why not.

Q. Assertion: Sodium reacts vigorously with cold water but magnesium does not react with cold water.
Reason: Sodium is more reactive than magnesium.

Q. Why does sodium react vigorously with water?

Q. Assertion :Copper is used to make hot water tanks and not steel (an alloy of iron). Reason: Copper does not react with cold water, hot water or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.

Q. Sodium ________ reacts vigorously with cold water.