Question

Explain the reactivity of alkali metals towards water and hydrogen.​

Answer 1

Answer:

All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced. The speed and violence of the reaction increases as you go down the group. This shows that the reactivity of the alkali metals increases as you go down Group 1.

Answer 2

Answer:

• The alkali metals are highly reactive towards the air and water and due to the only reason they kept in kerosen oil and not in free state.
• Explanarion:
• With water they formed hydroxide explosively and released hydrogen gas as :
• 2M + 2H2O = 2MOH + H2
• The metal react with air to form oxides or hydroxide depending on the humidity and nature of the air as for ex: (a) 2Na + O2 = Na2O2 (b) 4Na + O2 = 2Na2O