Question
Iodine test is used to check the presence of _________.
- Fat
- protein
- Both A and B
- Carbohydrates
Hint:
It is a biomolecule that consists of carbon, hydrogen, and oxygen atoms, usually with a hydrogen-oxygen atom ratio of 2:1.
The correct answer is: Carbohydrates
- Carbohydrate-containing foods are made of starch, so iodine tests are used to detect carbohydrates. The iodine test is used to check the availability of starch-like carbohydrates in the sample.
- Starch turns a deep 'blue-black' color upon the addition of an aqueous solution of the triiodide anion due to the formation of intermolecular charge transfer components (complexes).
- In the iodine-starch test, when the triiodide anion comes into contact with starch, it rapidly turns dark blue-black.
- Color intensity decreases with increasing temperature and in the presence of water-soluble organic solvents such as ethanol.
- Starch is hydrolyzed in this state, so the test cannot be performed at a very low pH.
Related Questions to study
___________ is used for bleaching cotton and jute fibers.
___________ is used for bleaching cotton and jute fibers.
Which element irritates the mucous membrane?
Which element irritates the mucous membrane?
Choose which one of the following fibers is the strongest.
Choose which one of the following fibers is the strongest.
Match the following.
Match the following.
Choose which of the following is the typical behaviour of plastic.
Choose which of the following is the typical behaviour of plastic.
____ is the synthetic fiber used to make parachutes.
The correct option is c)Nylon.
Nylon threads are very strong and can withstand high loads. As such, it is used to make parachutes and ropes for climbing. Nylon fibers are strong, elastic and shiny. It is easy to wash, dries quickly even after washing, and does not lose its shape. These properties make it ideal for making parachutes and raincoats.
____ is the synthetic fiber used to make parachutes.
The correct option is c)Nylon.
Nylon threads are very strong and can withstand high loads. As such, it is used to make parachutes and ropes for climbing. Nylon fibers are strong, elastic and shiny. It is easy to wash, dries quickly even after washing, and does not lose its shape. These properties make it ideal for making parachutes and raincoats.
Assertion: Nylon fibers cannot be used for making ropes for climbers.
Reason: Nylon fibers are very strong fibers.
Assertion: Nylon fibers cannot be used for making ropes for climbers.
Reason: Nylon fibers are very strong fibers.
Select the correct R principle for the statement. “To use something again that you would normally throw away.”
The correct option is b)Reuse.
Reuse is the act or practice of using an item, whether for its original purpose or to perform some other function. This should be distinguished from recycling, which dismantles used items to produce raw materials for manufacturing new products.
Select the correct R principle for the statement. “To use something again that you would normally throw away.”
The correct option is b)Reuse.
Reuse is the act or practice of using an item, whether for its original purpose or to perform some other function. This should be distinguished from recycling, which dismantles used items to produce raw materials for manufacturing new products.
Ester is used in repeating units in the making of polyester. Choose true or false.
The statement is true.
- Polyester is a man-made or synthetic fiber made up of repeating units of chemicals called esters.
- Esters are sweet-smelling compounds composed primarily of carbon, hydrogen, and oxygen.
- The most commonly used polyester formula is: As an ester, it is made from the acid benzene-1,4-dicarboxylic acid (terephthalic acid) and the alcohol ethane-1,2-diol.
- It is better known by the mundane name of polyethylene terephthalate (PET).
Ester is used in repeating units in the making of polyester. Choose true or false.
The statement is true.
- Polyester is a man-made or synthetic fiber made up of repeating units of chemicals called esters.
- Esters are sweet-smelling compounds composed primarily of carbon, hydrogen, and oxygen.
- The most commonly used polyester formula is: As an ester, it is made from the acid benzene-1,4-dicarboxylic acid (terephthalic acid) and the alcohol ethane-1,2-diol.
- It is better known by the mundane name of polyethylene terephthalate (PET).
Select the other name for artificial silk.
The correct option is b)Rayon.
Rayon is a semi-synthetic fiber made from natural sources of regenerated cellulose such as wood and related agricultural products. It has the same molecular structure as cellulose. Also called viscose. Viscose fibers and films come in many types and qualities.
Select the other name for artificial silk.
The correct option is b)Rayon.
Rayon is a semi-synthetic fiber made from natural sources of regenerated cellulose such as wood and related agricultural products. It has the same molecular structure as cellulose. Also called viscose. Viscose fibers and films come in many types and qualities.
Choose the fiber which is termed artificial wool.
The correct option is b)Acrylic.
- Polyester is a synthetic fiber obtained from coal or petroleum.
- Polyester is durable but breathable and not designed to absorb liquids.
- Acrylic fibers are made using acrylonitrile or vinyl cyanide polymers.
- Acrylic is often considered an imitation of wool because it retains heat.
Choose the fiber which is termed artificial wool.
The correct option is b)Acrylic.
- Polyester is a synthetic fiber obtained from coal or petroleum.
- Polyester is durable but breathable and not designed to absorb liquids.
- Acrylic fibers are made using acrylonitrile or vinyl cyanide polymers.
- Acrylic is often considered an imitation of wool because it retains heat.
Select the year in which nylon was made.
The correct option is a)1931.
Nylon, a synthetic plastic material composed of polyamides of high molecular weight, usually but not always manufactured as fibers. In the 1930s he founded the E.I. du Pont de Nemours & Company.
Nylons are a family of materials called polyamides, made by reacting carbon-based chemicals found in coal and petroleum in a heated, high-pressure environment. This chemical reaction, known as condensation polymerization, forms large polymers in the form of nylon films.
Select the year in which nylon was made.
The correct option is a)1931.
Nylon, a synthetic plastic material composed of polyamides of high molecular weight, usually but not always manufactured as fibers. In the 1930s he founded the E.I. du Pont de Nemours & Company.
Nylons are a family of materials called polyamides, made by reacting carbon-based chemicals found in coal and petroleum in a heated, high-pressure environment. This chemical reaction, known as condensation polymerization, forms large polymers in the form of nylon films.
Uses of rayon include
The correct option is d)All of the above.
Uses of Rayon: Rayon is a semi-synthetic fiber made from regenerated cellulose. Along with natural cellulose fibers such as cotton, kapok, linen, hemp, jute and ramie, rayon is used in a wide range of home furnishings, fine functional fashion fabrics.
1. Used to produce fibers in the textile industry.
2. Rayon is used for the tire cord.
3. Also used to make carpets and surgical bandages.
Uses of rayon include
The correct option is d)All of the above.
Uses of Rayon: Rayon is a semi-synthetic fiber made from regenerated cellulose. Along with natural cellulose fibers such as cotton, kapok, linen, hemp, jute and ramie, rayon is used in a wide range of home furnishings, fine functional fashion fabrics.
1. Used to produce fibers in the textile industry.
2. Rayon is used for the tire cord.
3. Also used to make carpets and surgical bandages.
Synthetic fibers do not absorb much
The correct option is c)Water.
Synthetic fibers absorb less water than natural fibers because there are no voids between each fiber. Because water does not penetrate the individual fibers of this fabric, it dries quickly. Hydrophilic fibers readily absorb water without causing discomfort to the wearer, whereas hydrophobic fibers are where the fibers do not absorb water.
Synthetic fibers do not absorb much
The correct option is c)Water.
Synthetic fibers absorb less water than natural fibers because there are no voids between each fiber. Because water does not penetrate the individual fibers of this fabric, it dries quickly. Hydrophilic fibers readily absorb water without causing discomfort to the wearer, whereas hydrophobic fibers are where the fibers do not absorb water.
Choose one of the following, which is not a part of 4R’s formula.
The correct option is d)Reinvent.
- Reduce consumption at source.
- Reuse items as often as possible to extend the life of the item.
- maximum recycling.
- RECOVER is composting garbage that can be decomposed at home.
- There are 4 Rs necessary to protect and sustain the environment.
- The 4 R's are Reduce, Reuse, Recycle and Recover. Reduce the amount of waste generated. If the material can be used, please modify and reuse the material.
- This reduces the amount of waste generated.
- Recycle waste and use recycled forms of waste. Reduce waste by maximizing waste recovery after recycling.
Choose one of the following, which is not a part of 4R’s formula.
The correct option is d)Reinvent.
- Reduce consumption at source.
- Reuse items as often as possible to extend the life of the item.
- maximum recycling.
- RECOVER is composting garbage that can be decomposed at home.
- There are 4 Rs necessary to protect and sustain the environment.
- The 4 R's are Reduce, Reuse, Recycle and Recover. Reduce the amount of waste generated. If the material can be used, please modify and reuse the material.
- This reduces the amount of waste generated.
- Recycle waste and use recycled forms of waste. Reduce waste by maximizing waste recovery after recycling.
