How many peptide bonds are present in a linear polypeptide made of 50 amino acids?
Correct answer C. 49
Subject / 763 questions
MDCAT ECAT Chemistry MCQs
Page 2 of MDCAT ECAT Chemistry multiple-choice questions with answers. Tap an option to check yourself.
Page 2 of 39
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
What is the molar mass of the dipeptide glycylglycine formed from two glycine molecules (glycine = 75 g mol⁻¹, H₂O = 18 g mol⁻¹)?
Correct answer D. 132 g mol⁻¹
Polyvinyl chloride (PVC) is obtained by addition polymerisation of ____.
Correct answer B. chloroethene
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Nylon-6,6 is made from hexanedioic acid and hexane-1,6-diamine. What type of polymerisation is this?
Correct answer C. Condensation polymerisation
Teflon is an addition polymer of which monomer?
Correct answer B. Tetrafluoroethene
Bakelite, a thermosetting plastic, is produced by condensation of ____.
Correct answer B. phenol and methanal
Cyanoacrylate adhesives (superglues) harden mainly by ____.
Correct answer D. rapid polymerisation triggered by moisture
Hot-melt adhesives form a bond when they ____.
Correct answer C. solidify on cooling after being applied molten
In a dye molecule, the group responsible for producing colour is called the ____.
Correct answer B. chromophore
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Azo dyes are characterised by the presence of which group?
Correct answer A. −N=N−
A substance such as alum used to fix a dye firmly onto a fabric is called a ____.
Correct answer D. mordant
Indigo is applied to cotton in its reduced, soluble form and then oxidised in air on the fibre. Indigo is therefore a ____ dye.
Correct answer A. vat
2-methylpropan-2-ol, (CH₃)₃COH, is classified as a ____ alcohol.
Correct answer A. tertiary
In the Lucas test (ZnCl₂ in concentrated HCl), which alcohol produces turbidity almost immediately at room temperature?
Correct answer B. 2-methylpropan-2-ol
Heating excess ethanol with concentrated H₂SO₄ at about 140 °C mainly gives ____.
Correct answer A. diethyl ether
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Ethanol reacts with ethanoic acid in the presence of concentrated H₂SO₄ to form ____.
Correct answer A. ethyl ethanoate
Phenol is a stronger acid than ethanol because ____.
Correct answer A. the phenoxide ion is stabilised by resonance
Phenol reacts with bromine water at room temperature to form a white precipitate of ____.
Correct answer C. 2,4,6-tribromophenol
Which reagent gives a violet colour with phenol but not with ethanol?
Correct answer B. Neutral FeCl₃ solution
The −OH group in phenol makes the benzene ring ____.
Correct answer C. activated and ortho-para directing