When nitrogen reacts with hydrogen under high temperature and pressure, ammonia, which is also a gas is formed. This is an example of:

chemical combination

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chemical decomposition

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physical change

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None of these

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Solution

The correct option is A chemical combination
It is a chemical combination reaction. The process converts atmospheric nitrogen (N₂) to ammonia (NH₃) by a reaction with hydrogen (H₂) using a metal catalyst under high temperatures and pressures. This process is known as Haber's Process.
Option (A) is correct.

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Nitrogen reacts with hydrogen under high temperature and pressure and forms ammonia. Which type of change is undergone in the given example?

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