Question

1. Solid calcium oxide was taken in a container and water was added slowly to it.
i. Sate two observations made in the experiment.
ii. Write the name of the chemical formula of the product.
2. What is the difference between displacement and double displacement reactions?Write
equations for these reactions.
3. Suggest two ways to check the rancidity of food articles.
4. What happens when:
CO​2(​ g) is bubbled through lime water (i) in small amount (ii) in excess

Answer 1

Explanation:

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2. Displacement reaction is a chemical change, in which a more active element displaces a less reactivate element from its salt solution. ... Double displacement reaction is a chemical change in which two compounds exchange their radicals with each other to form new compounds. Example - Mg + H2So4 ---> MgSo4 + H2.
3. The two ways to check rancidity of food articles are (i) Keep the food articles in airtight containers. (ii) Keep the food articles in refrigerator.
4. When carbon dioxide gas(CO2) is bubbled through lime water, it reacts with the carbon hydroxide to produce calcium carbonate. now, calcium carbonate CaCO3 is insoluble in water, it will precipitate from solution as it forms

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