Reactivity of alkali metals

Which Group in Periodic Table do Li, Na and K belong to?

• Group I

• Group II

• Group III

The solution turns pink when the pH is greater than 7. It means that the solution becomes

• acidic.

• alkaline.

What gas is produced so that an explosion occurs?

• carbon dioxide

• hydrogen

• oxygen

• steam

Which of the following observations are common in the reactions between these three metals and water?

(More than ONE answer.)

• Metals move around on the surface of water.

• Explosions occur.

• Fizzing sounds are produced.

• The solution turns pink with phenolphthalein

According to the experiment shown, what is the order of reactivity? (Most reactive metal first)

• Na, K, Li

• K, Li, Na

• Li, Na, K

• K, Na, Li