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JEE-Main - Grade 12 - Chemistry - The Solid State - Introduction and Snapshot of The Solid State - Study ref# 851

Introduction: We are mostly surrounded by solids and we use them more often than liquids and gases. For different applications we need solids with widely different properties. These properties depend upon the nature of constituent part... read more

JEE-Main - Grade 12 - Chemistry - Amines - Introduction and Snapshot of Amines - Study ref# 887

Introduction: Amines constitute an important class of organic compounds derived by replacing one or more hydrogen atoms of ammonia molecule by alkyl/ aryl group(s). In nature, they occur among proteins, vitamins, alkaloids and hormones... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Introduction and Snapshot of Polymers - Study ref# 893

Introduction: The word ‘polymer’ is coined from two Greek words: poly means many and mer means unit or part. The term polymers is defined as very large molecules having higher molecular mass (). These are also referred to as macromo... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Introduction and Snapshot of Polymers - Study ref# 894

Following sections must be covered to understand the Polymers: 1. Classification of Polymers 2. Types of Polymerisation 3. Molecular Mass of Polymers 4. Biodegradable Polymers 5. Polymers of Commercial Importance... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Target Setup for Polymers - Study ref# 895

Student requires to achieve the following milestones to get better grip over Polymers. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%Subjec... read more

JEE-Main - Grade 12 - Chemistry - Biomolecules - Study ref# 10012

Nucleic acids are the polymers of (a) nucleosides (b) nucleotides (c) bases (d) sugars Answer: Nucleic acids are polymers of nucleotides in which nucleic acids are linked together by phosphodiester linkage. e.g., D.N.A... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10032

Which of the following polymers of glucose is stored by animals? (a) Cellulose (b)Amylose (c) Amylopectin (d) Glycogen Answer: (d) Glycogen is a polym... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10033

Which of the following is not a semisynthetic polymer? (a) cis-polyisoprene (b) Cellulose nitrate (c) Cellulose acetate (d) Vulcanised rubber Answer: (d) cis-polyisoprene is not a semisynthetic polymer while other three cellulose ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10034

Which of the following polymer is biodegradable? Answer: Poly -hydroxybutyrate – co--hydroxy valerate is an example of biodegradable polymer.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10035

Which of the following statements is not true about low density polythene? (a) Tough (b) Hard (c) Poor conductor of electricity (d) Highly branched structure Answer: (d) Lo... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10036

is a polymer having monomer units…….. Answer: can be obtained by addition polymerization of as shown below ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10037

Which of the following polymer can be formed by using the following monomer unit? (a) Nylon-6,6 (b) Nylon-2-nylon-6 (b) Melamine polymer (c) Nylon-6 Answer: (d) Given, ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10038

Which of the following are characteristics of thermosetting polymers? (a) Heavily branched cross linked polymers (b) Linear slightly branched long chain molecules (c) Become infusible on modeling so cannot be reused (d) Soften... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10039

Which of the following polymers are thermoplastic? (a) Teflon (b) Natural rubber (c)Neoprene (d) Polystyrene Answer: (a, d) Thermoplastic polymer (i) These are linear or slightly branched long chain molecules. ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10040

Which of the following polymers are used as fibre? (a) Polytetrafluoroethane (b) Polychloroprene (c) Nylon (d) Terylene Answer: (c, d) Nylon and terylene are used as fibre due to stron... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10041

Which of the following are addition polymers? (a) Nylon (b) Melamine formaldehyde resin (c) Orlon (d) Polystrene Answer: (c, d) Addition polymers are formed by the repeated addition of ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10042

Which of the following monomers form biodegradable polymers? (a) 3-hydroxybutanoic acid + 3-hydroxypentanoic acid (b) Glycine + amino caproic acid (c) Ethylene glycol +phthalic acid (d) Caprolactum Answer: (a , b) Biodegradable P... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10043

Which of the following are example of synthetic rubber? (a)Polychloroprene (b) Polyacrylonitrile (c) Buna-N (d) cis-polyisoprene Answer: (a, c) Synthetic Polymer Polymer which are not fo... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10044

A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 to 415 K and bonds are formed between chains. Write the structure of the product of this treatment? Hints – This problem is based on v... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10045

Identify the type of polymer Answer: Homopolymer as it contains only one type of monomer units .i.e., only A monomer units.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10046

Identify the type of polymer Answer: Copolymer as it contains more than one type of monomer units. Here, A and B are two types of monomer units.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10047

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following. Answer: Chain growth polymerisation, as there is no loss of small molecules like water; methanol etc. ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10048

Identify the type of polymer given in the following figure. Answer: Cross-linked or network polymer. ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10049

Identify the polymer given below. Answer: The given polymer is formed by 1,4-addition of 2-methylbuta-1,3-diene(isoprene) and stereochemistry is ‘cis’ throughout. Therefore, the given polymer is ‘cis’ – polyisoprene i.e., natural rubber.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10050

Can enzyme be called a polymer? Answer: Yes, these are made up of proteins which are polymers of amino acids.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10051

Why does cis-polyisoprene posses elastic property? Answer: Cis-polyisoprene is also known as natural rubber. Its elastic property is due to the existence of weak van der Waals’ interactions between their various polymer chains.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10052

What is the structural difference between HDP and LDP? How does the structure account for different behavior and nature, hence use of a polymer? Answer: HDP (high density polymer) consist of linear molecule and has a high density due to clos... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10053

Which factor imparts crystalline nature to a polymer like nylon? Answer: Strong intermolecular forces like hydrogen bonding and linear structure that lead to close packing of chains and hence, imparts crystalline character e.g., nylon.... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10054

Match the polymer of Column I with correct monomer of Column II. Answer: A→ (5) B→(3) C→(1) D→(2) E→(4) Column I represents various kind of polymer and Column II represents their m... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10055

Match the polymer given in Column I with their commercial names given in Column II. Answer: A→(2) B→(3) C→(1) D→(5) E→(4) Column I represents monomers of polymer and Column II r... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10056

Match the polymer given in Column I with their main applications given in Column II. Answer: A→(4) B→(5) C→(1) D→(6) E→(4) F→(3) ... read more

JEE-Main - Grade 12 - Chemistry - Polymers - Study ref# 10057

Match the polymer given in Column I with the preferred mode of polymerisation followed by their monomers Column II. Answer: A→(4) B→(1) C→(2) Column I represents name of various polymer and Column II re... read more