By giving a reason state why chemical change takes place in the following case: Heating of ammonium chloride in a test tube.

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Solution

Chemical change: The process in which the composition of substance is completely altered and a new product is formed is called a chemical change.
When the solution of ammonium chloride $({NH}_{4} Cl)$ is heated above the temperature of $340 ° C$ , it forms Ammonia $({NH}_{3})$ and Hydrogen Chloride $(HCl)$ . Hence it is a chemical change.
${NH}_{4} Cl (s) \overset{∆}{\to} {NH}_{3} (g) + HCl (g)$

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