Toc MCQ Test Chapter No. 2 And 3

This statement is false. Extenders are not used to accelerate the drying process. Extenders are actually used to increase the volume or extend the coverage of a paint or coating without affecting its drying time. They are typically added to reduce the cost of the paint or to modify its properties, but they do not have any impact on the drying speed.

Nickel is used as a catalyst for the hydrogenation of oil. Hydrogenation is a chemical process that involves the addition of hydrogen to unsaturated fats or oils to make them more solid and increase their shelf life. Nickel catalysts are commonly used in this process because they have the ability to adsorb and activate hydrogen molecules, allowing them to react with the carbon-carbon double bonds present in unsaturated oils. This reaction helps to convert these double bonds into single bonds, resulting in the saturation of the oil and the formation of a solid or semi-solid product.

Titanium dioxide is a white pigment commonly used in various industries such as paint, cosmetics, and food. It is known for its excellent opacity, brightness, and ability to reflect light. Due to its high refractive index, it effectively scatters and reflects light, resulting in a bright white appearance. Titanium dioxide is also chemically stable and resistant to discoloration, making it a popular choice for achieving a white color in various products. Therefore, the presence of titanium dioxide in white pigment is a valid explanation for the correct answer.

The correct answer is "All of above." This means that all three solvents mentioned - hexane, benzene, and petroleum ether - can be used for oil extraction. These solvents are commonly used in various extraction processes due to their ability to dissolve oils and fats effectively. Each solvent may be preferred based on the specific requirements of the extraction process or the type of oil being extracted.

In the cleansing action of soap, the polar end is water soluble. This means that the polar end of the soap molecule is attracted to water molecules. When soap is mixed with water, the polar end of the soap molecule forms hydrogen bonds with water molecules, allowing it to dissolve in water. This property of soap allows it to effectively remove dirt and oil from surfaces, as the water-soluble polar end of the soap molecule can surround and lift away oil and dirt particles, which are typically not water soluble.

The correct answer is "All of above". Vegetable oil can be used for the production of biodiesel, as it can be converted into a renewable and environmentally friendly fuel. It is also commonly used for cooking purposes, as it is a healthier alternative to other types of oil. Additionally, vegetable oil is used in the manufacturing of paint, as it helps to create a smooth and glossy finish. Therefore, all of the given options are valid uses of vegetable oil.