Give a balanced equation for lab preparation of Ethylene. How is the gas collected?

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Solution

Lab Preparation of Ethylene:
In the laboratory, it is prepared by dehydration of Ethyl alcohol $(C H_{3} C H_{2} O H)$ .It is heated with excess sulphuric acid at a temperature around $160 - 170 ° C$ in a round bottom flask with thistle funnel and delivery tube.
The reactions involved is:
$\underset{(E t h y l a l c o h o l)}{C_{2} H_{5} O H (l)} \overset{c o n c . H_{2} S O_{4}}{\to} \underset{(E t h y l e n e)}{C_{2} H_{4} (g)} + \underset{(w a t e r)}{H_{2} O (l)}$
Gas Collection:
The gas coming out of the delivery tube is passed through a wash bottle containing Potassium hydroxide $(K O H)$ or Sodium hydroxide $(N a O H)$ solution.
Pure Ethylene is hence collected by downward displacement of water.

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