Q43 of 400 Page 133

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

Hydrogen do not generally react with any metals. However only few very reactive metals reacts with Hydrogen to form metal hydrides. For example: Sodium Hydride is formed when Hydrogen gas is passed over heated sodium.

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42 Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid. 42 Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid. 43 How do non-metals react with hydrogen? Explain with an example. 44 What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place.