Question

When sodium or potassium is dropped in water, we can observe a golden yellow or a lilac coloured flame respectively whereas when calcium is dropped , no flame is observed . Why is there a difference in observation in the above two cases?

Answer 1

(i) Comparision of Na , K , Ca with that of water.
(ii) Comparision of physical properties of Na , K and Ca.
(iii) Type of reaction that takes place when these metals react with water .
(iv) Condition required for burning.