Question

1) A metal X is stored under kerosene. When a sample piece of it is left open in the air, it catches fire. When the product is dissolved in water it turns red litmus to blue.
A) Name metal X
B) write the chemical eqn. For the reaction when
1) it is exposed to air.
2) the product is dissolved in water

Answer 1

A) Potassium or Sodium.
B) 1) 4Na + O2 -------> 2Na2O
2) Na2O + H2O ----> 2NaOH

Answer 2

A) Potassium or Sodium.
B) 1) 4Na + O2 -------> 2Na2O
2) Na2O + H2O ----> 2NaOH