Question 39 (Textile Engineering & Fibre Science)
Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: Sodium chloride is a bleaching agent for cotton.
[r]: Sodium chloride is an effective reducing agent.
| (A) | Both [a] and [r] are true and [r] is the correct reason for [a] |
| (B) | Both [a] and [r] are true but [r] is not the correct reason for [a] |
| (C) | Both [a] and [r] are false |
| (D) | [a] is true but [r] is false |
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Frequently Asked Questions | FAQs
What is sodium chloride used for?
Sodium chloride is commonly known as table salt and is primarily used as a seasoning and flavoring agent in cooking and food preparation. It is also used as a preservative to prevent the spoilage of food products. In addition to its culinary uses, sodium chloride has a variety of other applications, including:
1)Water treatment: Sodium chloride is used in the treatment of water to remove impurities and make it safe for consumption.
2)Medical applications: Sodium chloride is used in intravenous (IV) fluids to replenish fluids and electrolytes in the body.
3)Chemical manufacturing: Sodium chloride is used in the production of various chemicals, such as chlorine and sodium hydroxide.
4)Deicing: Sodium chloride is used as a deicing agent to melt ice and snow on roads and sidewalks during winter.
5)Agriculture: Sodium chloride is used as a fertilizer to supplement soil with essential nutrients.
6)Animal feed: Sodium chloride is added to animal feed to provide essential minerals and improve the taste of the feed.
Overall, sodium chloride has a wide range of practical applications in various industries and is a versatile and important compound.
What is meant by bleaching agent or what is bleaching chemical in textile?
A bleaching agent is a substance that is used to remove or lighten the color of a material by oxidizing or reducing the pigments that give it color. Bleaching agents are commonly used in the textile industry to lighten fabrics, but they also have many other applications in different industries.
The bleaching process in cotton involves the use of chemicals to remove natural coloration and impurities from the fibers in order to create a white, uniform appearance. The specific bleaching chemicals used can vary depending on the desired outcome and the processing method, but commonly used chemicals include:
1)Hydrogen peroxide: Hydrogen peroxide is a common bleaching agent used in the cotton industry. It is a powerful oxidizing agent that reacts with the chromophores in the cotton fibers, breaking them down and removing the natural color.
2)Sodium chlorite: Sodium chlorite is a chemical that is used as a bleaching agent in the production of cotton. It is typically used in combination with an acid, such as hydrochloric acid, to create chlorine dioxide, which is a powerful bleaching agent.
3)Sodium hypochlorite: Sodium hypochlorite, also known as bleach, is another common bleaching agent used in the cotton industry. It works by oxidizing and breaking down the natural coloration in the cotton fibers.
4)Calcium hypochlorite: Calcium hypochlorite is a strong bleaching agent that is used in the cotton industry to remove impurities and natural coloration from the fibers.
Overall, the choice of bleaching chemical used in cotton processing depends on the desired outcome and the specific processing method. While these chemicals are effective at achieving a uniform white appearance in cotton, they can also have negative environmental impacts and require careful handling and disposal.
In the context of household cleaning products, bleaching agents are often used to remove stains or discolorations on surfaces such as fabrics, carpets, and tiles. Bleaching agents such as hydrogen peroxide, chlorine bleach, and sodium hypochlorite can break down or remove organic stains, including those caused by blood, grass, or coffee.
Bleaching agents can also be used in the production of paper, where they are used to remove lignin and other impurities from wood pulp to make the paper brighter and whiter. In the food industry, bleaching agents are used to remove unwanted colors from edible oils, such as palm oil or coconut oil.
Overall, bleaching agents are used to lighten or remove color from materials and substances in various industries and applications.
What is reducing agent or what is reducing agent in textile?
A reducing agent is a substance that causes another substance to undergo a reduction reaction, which involves the gain of one or more electrons. In a reduction reaction, the reducing agent itself is oxidized as it donates electrons to the other substance.
Reducing agents are commonly used in the textile industry to remove or reduce the color of certain dyes in order to achieve specific colors or effects. This process is called “discharge printing” and involves applying a reducing agent to dyed fabric in order to break down or destroy the dye molecules.
One common reducing agent used in textile dyeing and printing is sodium hydrosulfite (Na2S2O4). Sodium hydrosulfite is a powerful reducing agent that can be used to remove or discharge a wide range of dyes from fabrics, including direct, reactive, and vat dyes. Other reducing agents used in textile dyeing and printing include thiourea dioxide (also known as formamidine sulfinic acid) and zinc formaldehyde sulfoxylate.
Reducing agents are also used in the production of indigo-dyed denim fabric. Indigo is a vat dye that must be reduced in order to be soluble in water and applied to fabric. The reduction process is achieved through the use of a reducing agent, such as sodium dithionite, which breaks down the indigo molecule into a soluble form that can be absorbed by the fabric.
Overall, reducing agents are important in the textile industry for achieving specific colors and effects in dyeing and printing processes. They are used to break down or destroy certain dyes in order to create a desired color or design on the fabric.
Reducing agents are commonly used in various chemical reactions, including in the production of metals from their ores, in the manufacture of chemicals, and in organic chemistry. Some common reducing agents include:
Metals such as zinc, magnesium, and iron, which can donate electrons to other substances.
Hydrides such as lithium aluminum hydride (LiAlH4) and sodium borohydride (NaBH4), which are strong reducing agents used to reduce carbonyl groups in organic chemistry.
Sulfur dioxide (SO2), which is a reducing agent used in the production of sulfuric acid.
Carbon monoxide (CO), which is a reducing agent used in the production of iron from iron ore in the blast furnace.
Hydrogen gas (H2), which is a common reducing agent used in various chemical reactions, including in the production of ammonia from nitrogen gas.
Overall, reducing agents are important in a variety of chemical processes and are used to promote reduction reactions by donating electrons to other substances.