Q38 of 79 Page 3

How do metals react with hydrogen? Explain with an example.

Only very few reactive metals like sodium, potassium, calcium and magnesium react with hydrogen to form metal hydrides. Example when hydrogen gas is passed overheated sodium, sodium hydride is formed.

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36 a) State why hydrogen is said to be a clean fuel?
b) What property of hydrogen is involved in being a good fuel?
c) What is hydrogenation of oils? Write one application. 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. 39 Name a metal which is stored in kerosene oil. 40 Metals are electropositive in nature. Explain.