Test: Important Chemical Compounds - 1 - Class 10 MCQ

The chemical formula for baking soda is NaHCO₃, which stands for sodium bicarbonate. Baking soda is commonly used in various applications such as in cooking, as an antacid, and as a water softener due to its alkaline properties.

 Used as a cleansing agent in industries and households. It finds its application in paper, textile, soap, and detergent industries.

Mentions sugar (sucrose), salt (sodium chloride), and diamond as examples of materials with crystalline structures. Diamond has a well-defined internal arrangement of atoms, making it a crystal. Graphite, on the other hand, is not mentioned in the examples provided.

The water that combines with a salt to form crystals is known as water of crystallization. This water is integral to the formation of crystals and is a key part of the crystallization process.

- The process in question is deposition.
- Deposition involves a gas transforming directly into a solid without passing through the liquid state.
- An example of deposition is the formation of frost, where water vapor in air turns directly into ice crystals on a cold surface.
- This process is the reverse of sublimation, where a solid turns directly into a gas.
- Other options, like evaporation and precipitation, involve changes to or from liquid states.

The chemical formula for Plaster of Paris is CaSO₄. ½ H₂O. When gypsum is heated to a certain temperature, it undergoes a reaction to yield CaSO₄. ½ H₂O, which is the compound that forms Plaster of Paris. This compound indicates that two units of CaSO4 share one molecule of water, giving it its specific chemical composition.

The chemical formula of bleaching powder is CaOCl₂. This compound is commonly used as a bleaching agent in the textile industry and as an oxidizing agent and disinfectant in various other industries due to its strong oxidizing properties.