Question

Name two metals which react violently with cold water. List any three observations which a student notes when these metal are dropped in a beaker containing water.

Write a test to identify the gas evolved (if any) during the reaction of these metals with water.

When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as :

Assertion (A) : Hydrogen gas is not evolved when zinc reacts with nitric acid. Reason (R) : Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.