Name a metal which is stored in kerosene oil.

37 What is the formula of Ammonia? Write the flow diagram for the manufacture of ammonia by Haber's process. State any two of its physical properties. Write the equation for its reaction with HCl. 38 How do metals react with hydrogen? Explain with an example. 40 Metals are electropositive in nature. Explain. 41 Explain the displacement of hydrogen by a metal from an acid with an example. Give the equation to support the same.