MHT CET 2026 Chemistry Question Paper with Answer and Solution

(C) Step $1$: $Terylene$ (also known as $Dacron$) is a condensation polymer.
Step $2$: It is prepared by the polymerization of $Ethane-1,2-diol$ (ethylene glycol) and $Benzene-1,4-dicarboxylic$ acid (terephthalic acid).
Step $3$: The reaction involves the loss of water molecules to form an ester linkage, resulting in the polyester $Terylene$.

(A) $1$. Thermosetting polymers are cross-linked polymers that become hard and infusible on heating and cannot be remolded.
$2$. $Urea-formaldehyde$ resin is a classic example of a thermosetting polymer.
$3$. $Polystyrene$, $Buna-S$, and $Terylene$ are thermoplastic polymers or elastomers, which can be softened or reshaped upon heating.

(C) Step $1$: Urea-formaldehyde resin is a thermosetting polymer formed by the condensation polymerization of urea and formaldehyde.
Step $2$: The chemical structure of the repeating unit in urea-formaldehyde resin is $[NH - CO - NH - CH_2]_n$.
Step $3$: Option $(A)$ represents polyacrylamide, $(B)$ represents polystyrene, $(C)$ represents urea-formaldehyde resin, and $(D)$ represents Nylon-$6$.
Step $4$: Therefore, the correct option is $(C)$.

(C) $1$. Condensation polymerisation involves the repeated condensation reaction between two different bi-functional or tri-functional monomeric units, often with the elimination of small molecules like $H_2O$, $HCl$, or $NH_3$.
$2$. $[CF_2 - CF_2]_n$ is $Teflon$, which is an addition polymer of $tetrafluoroethene$.
$3$. $[CH_2 - CH_2]_n$ is $Polyethylene$, which is an addition polymer of $ethene$.
$4$. $[NH - (CH_2)_5 - CO]_n$ is $Nylon-6$, which is obtained by the ring-opening polymerisation of $caprolactam$. While often classified as a chain-growth process, it is structurally a polyamide formed via the hydrolysis and subsequent condensation of $caprolactam$.
$5$. Therefore, $Nylon-6$ is the correct choice as it represents a condensation-type polymer structure.

(B) Step $1$: Identify the structure of the given polymers.
Step $2$: High density polyethylene $(HDPE)$ is a linear polymer.
Step $3$: Low density polyethylene $(LDPE)$ is formed by free radical polymerization under high pressure, resulting in a highly branched structure.
Step $4$: $PVC$ and Melamine are generally linear or cross-linked polymers.
Step $5$: Therefore, $LDPE$ is the correct example of a branched-chain polymer.

(D) Step $1$: Identify the polymerization type for each option.
Step $2$: Polythene, Polyacrylonitrile, and Teflon are addition polymers formed by the polymerization of unsaturated monomers (alkenes or their derivatives).
Step $3$: Dacron (also known as Terylene) is a polyester formed by the condensation reaction between ethylene glycol $(HO-CH_2-CH_2-OH)$ and terephthalic acid $(C_6H_4(COOH)_2)$, involving the elimination of small molecules like water $(H_2O)$.
Step $4$: Therefore, Dacron is obtained by condensation polymerization.

(A) Step $1$: Identify the nature of the given polymers. $PVC$, $Polystyrene$, and $PTFE$ are thermoplastic polymers, which soften on heating and harden on cooling.
Step $2$: $Bakelite$ is a phenol-formaldehyde resin. It is formed by the condensation polymerization of phenol and formaldehyde, resulting in a highly cross-linked structure.
Step $3$: Because of this cross-linked network, $Bakelite$ cannot be reshaped upon heating, making it a thermosetting polymer.
Step $4$: Therefore, $Bakelite$ is the correct answer.

(C) Step $1$: Enzymes are biological catalysts that speed up chemical reactions.
Step $2$: They lower the activation energy of reactions, not increase it.
Step $3$: They do not alter the equilibrium constant of a reaction; they only help reach equilibrium faster.
Step $4$: Enzymes are not consumed in the reaction; they remain unchanged at the end.
Step $5$: Enzymes are highly specific in their action, meaning a particular enzyme acts on a specific substrate.

(B) Hard water contains dissolved salts of calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions.
When soap (sodium or potassium salts of long-chain fatty acids) is added to hard water, these ions react with the soap to form insoluble precipitates known as $Scum$.
This process prevents the soap from forming a lather, making it ineffective for cleaning in hard water.

(A) Cationic detergents are quaternary ammonium salts of amines with acetates, chlorides, or bromides as anions. They possess long hydrocarbon chains and a positive charge on the nitrogen atom. These are primarily used in hair conditioners because they have germicidal properties and help in conditioning the hair. Therefore, hair conditioner is the correct answer.

(C) Cationic detergents are quaternary ammonium salts of amines with acetates, chlorides, or bromides as anions. These possess germicidal properties and are used in hair conditioners and germicidal formulations.

(A) $Aspirin$ $(acetylsalicylic \ acid)$ is a well-known drug that acts as an analgesic, which is used to relieve pain, and also as an antipyretic, which is used to reduce fever. Therefore, it is classified as an analgesic.

(C) Antipyretics are a class of drugs used to lower body temperature in cases of high fever.
Therefore, the correct use of antipyretic drugs is to reduce fever.

(A) Step $1$: Analgesics are a class of drugs specifically designed to relieve pain without causing impairment of consciousness, mental confusion, incoordination, or paralysis.
Step $2$: Antipyretics are used to reduce fever.
Step $3$: Antibiotics and antimicrobials are used to treat infections caused by microorganisms.
Step $4$: Therefore, the correct term is Analgesic.

(A) $Formalin$ is a $40\%$ aqueous solution of $methanal$ $(formaldehyde)$. It is primarily used for the preservation of biological and anatomical specimens because it prevents the decay of tissues by cross-linking proteins.

(A) $Methyl \ salicylate$ is commonly known as oil of wintergreen. It is widely used in topical creams and ointments for its analgesic (pain-relieving) properties, as it helps in reducing muscle and joint pain.

(C) Step $1$: Identify the analgesic compound. Methyl salicylate is a well-known analgesic and anti-inflammatory agent.
Step $2$: Determine the source. Methyl salicylate is naturally found in the leaves of the wintergreen plant (Gaultheria procumbens).
Step $3$: Conclude that wintergreen is the correct source for extracting this analgesic compound.

(C) Step $1$: Analyze the properties of the given compounds.
Step $2$: $Curcumin$ is a polyphenol found in turmeric with antioxidant and anti-inflammatory properties.
Step $3$: $Methyl \ salicylate$ is used as a topical analgesic.
Step $4$: $Cinnamaldehyde$ is the organic compound that gives cinnamon its flavor and odor and is well-documented for its antimicrobial properties, inhibiting the growth of bacteria and fungi.
Step $5$: $Ascorbic \ acid$ is $Vitamin \ C$, which acts as an antioxidant.
Step $6$: Therefore, $Cinnamaldehyde$ is the correct antimicrobial compound.

(B) Step $1$: $Aspirin$ is a common drug used as an analgesic and antipyretic.
Step $2$: Chemically, it is synthesized by the acetylation of $salicylic \ acid$ using acetic anhydride.
Step $3$: The resulting compound is $2-acetoxybenzoic \ acid$, which is commonly known as $acetyl \ salicylic \ acid$.