When zinc metal is heated with caustic soda solution, the gas evolved is

When silicon is boiled with caustic soda solution, the gas evolved is

When silicon is boiled with caustic soda solution the gas evolved is:

When ammonium chloride is heated with caustic soda, the gas evolved is……..

When Zinc metal is placed in hydrochloric acid , the gas evolved is ______.

When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.