Reasons for popularity of plastic: Plastic is non-reactive: Unlike iron; plastic does not react with air to form rust. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. This is because during manufacturing, it was often in a form where asbestos dust could be inhaled. D. Melamine. Bioplastic made from plant feedstock is not biodegradable. Give an example of a biodegradable aliphatic polyester. Expert Answer . An example of biodegradable aliphatic polyester is PHBV i.e., Poly b-hydroxybutyrate -co-b-hydroxy valerate. Melamine is resistant to fire and is hence used for making utensils. Epoxies are polymers and in more broader terms, can be classed as plastics. To add some context, the idea of combining epoxy resin with a filler is not new. Will it be in our lifetime? D. Proteins and PVC. Question 7. Answer – Some examples which show that plastics are non-corrosive in nature. 10. The total amount of epoxy resin / plastic required to make each product is reduced, because the bamboo fibres make up a significant percentage of the overall composite material. What is a Bio-degardable polymer? Which of the following is a branched polymer, having branched chain polysaccharide units ? Practice important Questions. a..Bakelite and b. Nylon- 6,6. _____ is an example of natural polymer a) Rayon b) Cellulose c) Nylon d) All of the above. The use of bamboo fibres as a filler is typically why bamboo plastic composites are often seen as an eco friendly option. Classification of Elements and Periodicity in Properties. People will appreciate that and it might just be the tipping point into convincing them your product is the better one.. 2. We did find some evidence that certain varieties of bamboo plastic composite products, could in theory be considered biodegradable. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. There are many reasons for this, right down to the fact that these composite products weigh less, therefore theoretically less fossil fuels need to be burned when transporting them. Its discovery is credited to Leo Bakeland who patented it in 1909. . Plastics are non-biodegradable. There are many variants of this bamboo plastic composite material and candid information is not always available on each variety, for consumers. He is currently working as a Principal Research Scientist and holds an Adjunct A/Professor position at RMIT University. Major product of the following reaction is : In Wolff‐Kishner reduction, the carbonyl group of aldehydes and ketones is converted into. Which of the following is Non-biodegradable a) Woolen clothes b) Plastic bag, c) Cotton cloth d) Wood. They remain on earth for thousands of years without any degradation. i need fast solve please. Molded Bakelite forms in a condensation reaction of phenol and formaldehyde, with wood flour or asbestos fiber as a filler, under high pressure and heat in a time frame of a few minutes of curing. Check out these seasonal immune boosting foods: A great alternative to plastic cling film because they’re mouldable, naturally antimicrobial and reusable. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. The two constituent parts are typically mixed together and heat and pressure is applied. Students can practice free MCQs as have been added by CBSE in the new Exam pattern. The problem is 28% of glass bottles in the US never reach the processing plants, and this means millions of ton going to landfills every year. Give an example of a biodegradable aliphatic polyester. The monomers in these types of condensation reactions are bi-functional or tri-functional in nature. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. ii) Condensation polymers: These polymers are formed by the combination of monomers, with the elimination of small molecules like water, alcohol etc. Nylon-66 is an example of elastomer. These are one of the oldest polymers that were synthesized by man. A) Wool B) cotton C) Silk D) Acrylic plz ans them Ans: A linear product of Phenol ­ formaldehyde polymer is Novolac, used in paints. The polymers which decompose on their own by bacterial action are called biodegradable polymers.Example of a biodegradable aliphatic polyester are Poly-β-hydroxy butyrate-co-β-hydroxy valerate (PHBV). These two molecules can link up with each other because each contains a reactive functional group, either an amine or a carboxylic acid which react to form an amide linkage. Cardanol Biodegradable Surfactant. Answer: ... For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. 18. Statistiques et évolution des crimes et délits enregistrés auprès des services de police et gendarmerie en France entre 2012 à 2019 Let’s look at a some examples. Therefore, producing blends of soy protein with some already-available biodegradable polyesters improves the water sensitivity and cost. Melamine is resistant to fire and is hence used for making utensils. (A) PHBV (B) PET (C) Nylon 6 (D) Bakelite (E) Glyptal. This is where the constituent chemicals used to make plastics are extracted from crops instead of from petroleum. 9. Polymers are also called macromolecules. We shall only consider two main concerns in our assessment of whether bamboo plastic composites are eco-friendly: Other significant considerations should be noted, but we shall perhaps discuss these in a separate article, simply because there would be too much to cover in one blog post. Bakelite’s low heat conductivity and strength, resulted in it being used for kitchenware products, as well as many other applications. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Bakelite made perhaps its largest stamp on the world of fashion. The interatomic bonding of these molecules is adamant, which makes it tough for microbes to break the bonds and digest them. Given that the ionic product of $Ni(OH)_2$ is $2 \times 10^{-15}$. The market value is extremely high, due to the retro feel and limited quantities of certain products. Phenol is made to react with formaldehyde. Products may need to be commercially composted in order to ensure that the conditions are suitable, to enable the item to biodegrade. Nylon 2-nylon 6 is another example of biodegradable polymers. C. bakelite and PVC. Your email address will not be published. Choose the correct answer: The purest natural form of cellulose is . Question 4 . Bakelite made perhaps its largest stamp on the world of fashion. Factors such as temperature, weathering and which types of micro organisms are present in any given environment, are important. Monomers are the. (i) Polyvinyl chloride (ii) Teflon (iii) Bakelite. -Bamboo itself is a renewable filler and can be farmed sustainably. Bakelite is used for making electrical switches, handles of various utensils etc. (i) Wood, paper, leather , (ii) Polythene, detergent, PVC Plastic, detergent, grass , (iv) Plastic, bakelite, DDT Try to make sure you and your family eat healthy, well-balanced me…, Drum roll please... presenting you with the winner of our competition is the youngest member of the Pandabode remot…. Plastics are persistent large-scale pollutants, and plastic debris (such as bottles, straws, containers, and plastic wrap) and particulates have been found in many environmental niches, from … Here is a compilation of Free MCQs of Class 10 Science Book Chapter 15 – Our Environment. These continue on … From a consumer perspective, it is very difficult to know exactly which epoxy resins, plastics and other chemicals have been used in the bamboo plastic composite manufacturing process. Bakelite Phenolic Resin Powder Heat Resistance For Brake Lining. Chemical reactions take place and once cured, a strong material with useful properties is formed. Which of the following characteristics does not affect the properties of plastics? Biodegradable materials break and return to nature with the help of decomposers. For example their primary machine axes are SKF manufactured from Sweden, and their electromagnetic switches utilize TELEMECANIQUE France made. ANS. Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon. -It is possible to make the plastic constituent have a lower overall environmental impact by using so called bioplastics. Identify compound X in the following sequence of reactions: Identify a molecule which does not exist. The bakelite is made from phenol and formaldehyde. Give an example of a biodegradable aliphatic polyester. 50KJ C. 500kJ D. 5000KJ . Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. Bakelite is an early 20th century example of a similar composite material. Something that biodegrades rapidly in open air may not necessarily degrade in the same way under land fill or underwater. Required fields are marked *. D. PET and polythylene. Check Answer a -Fossil fuels as a source material for the chemicals required to make plastic. Oh and yes you did read correctly, bakelite was sometimes made using asbestos. Of the following which one is classified as polyester polymer? These plastics cannot be softened again on heating. This means that in order to feel comfortable that our bamboo plastic kitchenware is really worthy of being called eco friendly, we probably need to consider three things: -Do we have access to industrial composting? How Long Does Glass Take To Decompose? (e) Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Unfortunately not without witnessing the manufacturing process or lab testing the product. CBSE Class 10 Science Book Chapter 15 “Our Environment” Multiple Choice Questions ‌(MCQs‌) with Answers. The result is a hard plastic material. Let’s fast forward a century or so after the invention of Bakelite, to the present day, where we are now seeing a similar technique used to make bamboo plastic composites. We do sell eco friendly products under the Pandabode brand and we regularly research interesting materials during our product design process, in order to identify opportunities where we can utilise suitable materials that satisfy the strict environmental criteria that we demand of all our products. The condensation reaction of the two reactants in a controlled acidic or basic medium results in the formation of ortho and para hydroxymethyl phenols and their derivatives. Physics. A. wood, paper, leather B. polythene, detergent, grass C. plastic, detergent, glass D. plastic, bakelite, DDT . Although it doesn’t completely solve the plastic problem, it could potentially help reduce it to some extent. 10. In both examples, PE remains non-corrosive. Check Answer and Sol Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. [CBSE AIPTM 2011] A. Nylon-66. 8. It came in several colors, including translucent and marbled shades by the 1950s. I mentioned earlier that glass could decompose and it can, but it’s not quick. PE does not absorb formic acid, which is corrosive. A. Which is non biodegradable? Often, chemical additives are included to give the composite material desirable properties, specific to its intended use case e.g. We would also probably need to make sure we have access to the appropriate industrial composting facilities too. Write the structure of this polymer. You’ve probably seen examples of containers, cups, bowls and lunch boxes marketed as ‘made from bamboo’. The entire supply chain and production methods are always relevant to the “eco credentials” of the end product. They typically look and feel a lot like plastic, with brown fibre speckles and sometimes come in bright colours. Biodegradable. -Using bamboo fibres as a filler in a composite material, does not necessarily make a product entirely biodegradable. Biodegradable Polymers: A polymer that can be decomposed by bacteria is called a biodegradable polymer. The polymers which decompose on their own by bacterial action are called biodegradable polymers.Example of a biodegradable … Show transcribed image text. The common examples of aliphatic biodegradable polymers are polyglycolic acid(PGA), Polyhydroxy butyrate (PHB), Polyhydroxy butyrates-co-beta hydroxyl valerate( PHBV), Polycaprolactone(pcl), Nylon-2-nylon-6. -Do we know and understand exactly what substances the manufacturer has used to create the composite material that the product is made from? Example of a biodegradable ... chemistry. 7. They include: -Health concerns. _____ is non-biodegradable material. Adopting an Eco-friendly packaging strategy will ensure your brand reflects a conscientious mindset. **2. Formaldehyde is a naturally occurring organic compound that is essential for the functioning of human and mammalian metabolisms. Question 15.12: Write the monomers used for getting the following polymers. If it’s not Biodegradable, then how long does it take to decompose? In this case that filler is bamboo fibres. II. A plastic bakelite is obtained from : Books. Some examples are ethene, vinyl chloride, acrylonitrile, phenol and formaldehyde etc. For example, body panels of an original Ford automobile were made of soy-based plastic. Which polymers occur naturally? Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. To ensure the correct environment for the product to be broken down, industrial composting may often be required. … 15.2. Video Explanation. -At this stage, bamboo plastic composites probably do not represent a complete or fully functional solution to our plastic waste problems. from Chemistry Polymers Class 12 CBSE. What is a biodegradable polymer ? 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