Write true or false for the following statements:

Heating ethanol at 443 K with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethene.

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Scum is formed due to the reaction of soap with calcium and magnesium salts present in hard water.

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Alcohols react with sodium leading to the evolution of carbon dioxide.

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Esters are most commonly formed by reaction of an aldehyde with ketones.

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Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.